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Home / DTC / P1142 — Fuel Restriction Condition

P1142 — Fuel Restriction Condition

Detailed page for trouble code P1142.

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P1142

FORD P — Powertrain

Fuel Restriction Condition

Brand: FORD
Type: P — Powertrain
Views: UK: 20 EN: 33 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
Your experience will help others
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Code

P1142

LINCOLN P — Powertrain

Fuel Restriction Condition

Brand: LINCOLN
Type: P — Powertrain
Views: UK: 21 EN: 32 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1142

MAZDA P — Powertrain

HO2S Bank 1 Sensor 2 Heater Circuit High Input

Brand: MAZDA
Type: P — Powertrain
Views: UK: 23 EN: 29 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1142

MERCURY P — Powertrain

Fuel Restriction Condition

Brand: MERCURY
Type: P — Powertrain
Views: UK: 17 EN: 26 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1142

Other P — Powertrain

Fuel Restriction Condition

Brand: Other
Type: P — Powertrain
Views: UK: 19 EN: 30 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
Workshop Manuals

Available brands with manuals

2
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Workshop Manual
Years: 2008 Manual in English Pages: 187 4.9 MB
Short description

Workshop manual for the 6‑speed manual gearbox 0B1 (front‑wheel drive). Includes identification, technical data, gearbox/selector removal & installation procedures, clutch hydraulics, adjustment instructions and front differential service. Applicable to Audi A4, Audi A5 (Coupé, Cabriolet, Sportback) and Audi Q5 as referenced in the manual. Edition: 05.2014.

Contents
Key sections:
  • 00 - Technical data
  • 1 Identification
  • 1.1 Gearbox identification
  • 2 Technical data
  • 2.1 Allocation of gearbox to engine
  • 2.1.1 Allocation - Audi A4 2008 ►
  • 2.1.2 Allocation - Audi A5 Coupé 2008 ►, Audi A5 Sportback 2010 ►
  • 2.1.3 Allocation - Audi A5 Cabriolet 2009 ►
  • 2.1.4 Allocation - Audi Q5 2008 ►
  • 2.2 Capacities
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Workshop Manual
Years: 1997 Manual in English Pages: 283 4.3 MB
Short description

Service manual for Audi A3 (1997) 1.6L 4‑cylinder (2‑valve) engines (codes AEH, AKL, APF). Includes technical data, engine removal/installation, crankshaft group, cylinder head and valve gear, lubrication, cooling and exhaust system procedures. Edition 07.2002.

Contents
Key sections:
  • 00 - Technical data ............................................................1
  • 1 Technical data ............................................................1
  • 1.1 Technical data .......................................................1
  • 1.2 Engine number .......................................................1
  • 1.3 Engine data ........................................................1
  • 10 - Removing and installing engine ..........................................3
  • 1 Removing and installing engine .........................................3
  • 1.1 Removing and installing engine ....................................3
  • 1.2 Removing - vehicles with engine codes AEH, AKL .....................4
  • 1.3 Removing - vehicles with engine code APF ..........................18
  • 1.4 Detaching engine from gearbox ...................................35
  • 1.5 Attaching engine to repair stand ................................38
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Workshop Manual
Years: 2004 Manual in English Pages: 235 3.8 MB
Short description

Official workshop manual for the Audi A3 2.0L FSI turbo engine (mechanics). Includes step‑by‑step removal/install procedures, technical data, tightening torques and diagnostic/repair instructions. Intended for professional garages and experienced technicians.

Contents
Key sections:
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Workshop Manual
Years: 2004 Manual in English Pages: 150 68.2 MB
Short description

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Contents
Key sections:
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Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007

Workshop Manual
Years: 2001–2003 Manual in English Pages: 307 7.3 MB
Short description

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Contents
Key sections:
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  • 10 - Removing and installing engine
  • 1 Removing engine - vehicles with manual gearbox
  • 1.1 Removing engine (tools, drain fluids, remove bumper, lock carrier, disconnect wiring, fuel, coolant, A/C lines, suspension components, propshaft, exhaust, support engine on platform, lower assembly)
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Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)

Workshop Manual
Years: 2001 Manual in English Pages: 259 2.0 MB
Short description

Workshop Manual for Audi A4 and A4 Cabriolet — Auxiliary Heater (Edition 08.2004). Contains self-diagnosis procedures, fault tables, electrical and fuel system checks, final control tests, CO₂ exhaust adjustment and step-by-step removal/installation and repair procedures. Intended for professional workshop use.

Contents
Key sections:
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  • 1.2 Function
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  • 1.4 Guided fault-finding
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  • 1.6 Test requirements for self-diagnosis
  • 1.7 Safety precautions
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Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)

Workshop Manual
Years: 2001 Manual in English Pages: 34 851.0 KB
Short description

Service manual for Audi A4 (2001‑) and A4 Cabriolet (2003‑) with 1.8L 4‑cylinder turbo engines. Covers Motronic fuel injection and ignition systems, diagnostic and maintenance procedures. Includes technical data, removal/installation steps and system checks.

Contents
Key sections:
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  • 1.3 Rules for cleanliness and instructions for working on fuel system
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  • 2.1 Technical data
  • 2.2 Overview of fitting locations - injection system
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  • 3.1 Exploded view - intake manifold
  • 3.2 Removing and installing intake manifold
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Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)

Workshop Manual
Years: 2003 Manual in English Pages: 369 9.1 MB
Short description

Comprehensive workshop manual for the Audi A8 (2003) electrical system — Edition 08.2014. Covers battery, alternator, starter, instrument cluster, wiper/washer systems, exterior/interior lighting and wiring repair procedures with step-by-step illustrations. Includes diagnostic and adjustment procedures and torque/data specifications.

Contents
Key sections:
  • 27 - Starter, current supply, CCS
  • 1 Contact corrosion
  • 2 Battery
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  • 2.2 Maintenance-free batteries
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  • 2.4 Removing and installing battery
  • - Remove luggage compartment side trim (right-side)
  • - Connect battery charger for back-up power
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  • - Remove battery retainer plate and lift battery out
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Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685

Workshop Manual
Years: 2021 Manual in English Pages: 186 82.7 MB
Short description

Official Audi Service Training self‑study programme SSP 685 for the Audi Q4 e‑tron (Type F4). Covers body, power units, power transmission, running gear, electrics & electronics, high‑voltage system, thermal management, driver assist and infotainment. Intended for internal service training and technical familiarisation; not a workshop repair manual.

Contents
Key sections:
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  • - Dash panel and centre console
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Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)

Workshop Manual
Years: 2018 Manual in English Pages: 645 14.8 MB
Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

Contents
Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
Download

Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
Download
LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Download

Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Download

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Download
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Code

P1142

SAAB P — Powertrain

O2S Heater Circuit. Current too High, Sensor 2.

Brand: SAAB
Type: P — Powertrain
Views: UK: 1 EN: 4 RU: 1
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
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Code

P1142

SUBARU P — Powertrain

Mass Air Flow Sensor Circuit Low Input

Brand: SUBARU
Type: P — Powertrain
Views: UK: 20 EN: 32 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1142

VOLKSWAGEN P — Powertrain

Load Calculation Cross Check Lower Limit Exceeded

Brand: VOLKSWAGEN
Type: P — Powertrain
Views: UK: 17 EN: 24 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or severely restricted fuel filter
  • Weak or failing fuel pump (low flow or pressure)
  • Collapsed or kinked fuel supply/return line
  • Restricted fuel tank vent or blocked filler neck
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel (debris, varnish, water)

Symptoms

  • MIL (check engine light) illuminated
  • Poor engine performance: hesitation, limp mode, reduced power
  • Hard starting or extended crank time
  • Stalling or sputtering under load or acceleration
  • Rough idle, intermittent misfire under load
  • Fuel pressure low on data/scan tool or failing to hold under load

What to check

  • Read freeze frame and live data with a scan tool (fuel rail pressure, fuel trims, pump duty)
  • Visually inspect fuel lines, fittings, tank vent and filler neck for kinks, restrictions or damage
  • Inspect/replace fuel filter if service interval or contamination suspected
  • Measure static and dynamic fuel pressure with a calibrated gauge at the fuel rail
  • Perform fuel pump flow/volume test and measure pump current/duty
  • Check fuel tank pickup screen/inlet for debris

Signal parameters

  • Fuel rail pressure (psi or kPa) — compare to OEM specified static and under-load values
  • Fuel rail pressure sensor voltage — typically ~0.5–4.5 V across range
  • Fuel pump current (A) or duty cycle (%) — higher than normal may indicate increased load/restriction
  • Short-term/long-term fuel trim (%) — large positive trims can indicate lean/fuel delivery issues
  • Injector pulse width (ms) — unusually long pulses with low pressure indicates low fuel pressure
  • MPG / engine load / RPM during failure events

Diagnostic algorithm

  1. Retrieve stored codes and freeze frame data. Note RPM/load when code set.
  2. Verify customer complaint and reproduce if safe. Monitor fuel rail pressure with a scan tool while driving/under load.
  3. Inspect accessible fuel system components: filter, lines, connectors, tank vent, filler neck for visible restrictions or damage.
  4. Install a calibrated fuel pressure gauge at the fuel rail. Record static (key on engine off) pressure and pressure under cranking and steady load. Compare to OEM spec.
  5. Perform a fuel pump flow test (volume over time) and check pump current to determine pump health.
  6. Check for restricted return flow (where applicable) or collapsed supply line — disconnect return to observe flow if safe and per procedure.
  7. Inspect fuel tank pickup and in-tank filter/sock for debris or contamination (may require tank removal or access panel).
  8. Test fuel pressure sensor output with a multimeter/scan tool; backprobe connector and wiggle-test wiring for intermittent faults.
  9. If pressure is low or flow insufficient, replace fuel filter and retest. If still low, replace fuel pump or clogged lines/strainers as indicated.
  10. If sensor or regulator faults are found, test and replace the faulty component and retest system operation.
  11. Clear codes, perform road test under the same conditions, and verify the code does not return and that fuel pressure/specs remain within range.

Likely causes

  • Clogged fuel filter or internal obstruction
  • Weak fuel pump causing low flow under load
  • Collapsed/kinked fuel line or restricted return
  • Faulty fuel pressure regulator or relief valve
  • Contaminated fuel or debris in pump/pickup

Fault status

⚠️ Status
The PCM detected fuel delivery or pressure below required thresholds indicating a fuel restriction condition. MIL set when fuel system cannot maintain expected pressure/flow under load.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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