Code
P02B4
Generic
P — Powertrain
Cylinder 7 - Injector Restricted
Views:
UK: 14
EN: 16
RU: 13
AI status
Completed
Completed
100%
Causes
- Clogged or partially blocked injector nozzle (deposits, varnish, debris)
- Contaminated fuel (sediment, water, varnish)
- Internal injector mechanical failure (stuck pintle, collapsed internal filter)
- Low fuel rail pressure or fuel supply restriction upstream
- Damaged or collapsed injector O-ring or seal causing air intrusion
- Wiring harness/connector problems reducing injector drive current
Symptoms
- Rough idle or vibration
- Misfire on cylinder 7 (often stored as P0307 or misfire code)
- Loss of power, hesitation, or stumble under load
- Poor fuel economy and increased emissions
- Hard starting or extended crank time
- Possible smoke or unusual combustion noise (diesel/forced-induction engines)
What to check
- Read and record DTCs and freeze frame data with a scan tool
- Monitor live data: injector pulse width, current/duty cycle, cylinder contribution/trim, short-term/long-term fuel trim
- Check fuel rail pressure and compare to spec under idle and load
- Inspect injector connector and wiring for corrosion, damage, or poor contact
- Measure injector coil resistance and compare to known good specs
- Perform a noid-light or oscilloscope test to verify injector drive pulse present
Signal parameters
- Injector coil resistance: depends on design (typical low-impedance 0.5–5 Ω, high-impedance 12–18 Ω) — compare to vehicle spec
- Injector pulse width at idle: typically a few milliseconds (varies by engine); significantly lower than expected indicates flow restriction
- Injector duty cycle under load: should increase with load; abnormal low pulse width or duty cycle for commanded conditions suggests restricted flow
- Fuel rail pressure: should be within manufacturer spec at idle and under commanded load
- Cylinder contribution/trim: Cylinder 7 may show a large positive short-term trim (lean) or large negative if compensation attempts fail
Diagnostic algorithm
- Retrieve stored codes and freeze frame data; note engine conditions when code set.
- Visually inspect injector 7 connector, wiring harness, and ground integrity. Repair any damage before further tests.
- With ignition on (engine off) measure injector 7 coil resistance; compare to spec and to another injector on a good cylinder.
- Use a noid light or oscilloscope to confirm injector drive pulses while cranking and running. Verify pulse width and waveform quality.
- Monitor live data with scan tool: compare injector pulse width and cylinder contribution/trim for cylinder 7 vs other cylinders.
- Check fuel rail pressure and flow. Replace fuel filter if contaminated or suspect. Verify regulator and pump operation.
- Perform a cylinder balance (disable injector 7 briefly) or swap injector 7 with a known-good injector from another cylinder; if symptom follows injector, replace or service injector.
- If injector follows, remove and perform a professional flow/cleaning test or replace with a new/known-good injector. If problem stays with cylinder, investigate wiring/PCM or mechanical issues (compression test, intake/exhaust leaks).
- After repair or replacement, clear codes and road-test under varied conditions to confirm fault does not return. Recheck for related codes (misfire, fuel trims).
- Safety note: relieve fuel system pressure and follow safe procedures when disconnecting fuel lines or removing injectors.
Likely causes
- Clogged injector nozzle from deposits or contaminated fuel
- Contamination in fuel (sediment or varnish) restricting flow
- Injector internal failure (pintle sticking or internal screen blockage)
- Low fuel pressure or restricted fuel filter reducing available flow
Fault status
Status
PCM reports restricted fuel injector flow to cylinder 7. Code set when injector flow or measured injection parameters fall below expected thresholds for the operating conditions.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P02B4
LAND ROVER
P — Powertrain
equilibrium of Cylinder 7 Cylinder
Views:
UK: 4
EN: 5
RU: 6
AI status
Completed
Completed
100%
Causes
- Clogged or partially blocked injector nozzle (deposits, varnish, debris)
- Contaminated fuel (sediment, water, varnish)
- Internal injector mechanical failure (stuck pintle, collapsed internal filter)
- Low fuel rail pressure or fuel supply restriction upstream
- Damaged or collapsed injector O-ring or seal causing air intrusion
- Wiring harness/connector problems reducing injector drive current
Symptoms
- Rough idle or vibration
- Misfire on cylinder 7 (often stored as P0307 or misfire code)
- Loss of power, hesitation, or stumble under load
- Poor fuel economy and increased emissions
- Hard starting or extended crank time
- Possible smoke or unusual combustion noise (diesel/forced-induction engines)
What to check
- Read and record DTCs and freeze frame data with a scan tool
- Monitor live data: injector pulse width, current/duty cycle, cylinder contribution/trim, short-term/long-term fuel trim
- Check fuel rail pressure and compare to spec under idle and load
- Inspect injector connector and wiring for corrosion, damage, or poor contact
- Measure injector coil resistance and compare to known good specs
- Perform a noid-light or oscilloscope test to verify injector drive pulse present
Signal parameters
- Injector coil resistance: depends on design (typical low-impedance 0.5–5 Ω, high-impedance 12–18 Ω) — compare to vehicle spec
- Injector pulse width at idle: typically a few milliseconds (varies by engine); significantly lower than expected indicates flow restriction
- Injector duty cycle under load: should increase with load; abnormal low pulse width or duty cycle for commanded conditions suggests restricted flow
- Fuel rail pressure: should be within manufacturer spec at idle and under commanded load
- Cylinder contribution/trim: Cylinder 7 may show a large positive short-term trim (lean) or large negative if compensation attempts fail
Diagnostic algorithm
- Retrieve stored codes and freeze frame data; note engine conditions when code set.
- Visually inspect injector 7 connector, wiring harness, and ground integrity. Repair any damage before further tests.
- With ignition on (engine off) measure injector 7 coil resistance; compare to spec and to another injector on a good cylinder.
- Use a noid light or oscilloscope to confirm injector drive pulses while cranking and running. Verify pulse width and waveform quality.
- Monitor live data with scan tool: compare injector pulse width and cylinder contribution/trim for cylinder 7 vs other cylinders.
- Check fuel rail pressure and flow. Replace fuel filter if contaminated or suspect. Verify regulator and pump operation.
- Perform a cylinder balance (disable injector 7 briefly) or swap injector 7 with a known-good injector from another cylinder; if symptom follows injector, replace or service injector.
- If injector follows, remove and perform a professional flow/cleaning test or replace with a new/known-good injector. If problem stays with cylinder, investigate wiring/PCM or mechanical issues (compression test, intake/exhaust leaks).
- After repair or replacement, clear codes and road-test under varied conditions to confirm fault does not return. Recheck for related codes (misfire, fuel trims).
- Safety note: relieve fuel system pressure and follow safe procedures when disconnecting fuel lines or removing injectors.
Likely causes
- Clogged injector nozzle from deposits or contaminated fuel
- Contamination in fuel (sediment or varnish) restricting flow
- Injector internal failure (pintle sticking or internal screen blockage)
- Low fuel pressure or restricted fuel filter reducing available flow
Fault status
Status
PCM reports restricted fuel injector flow to cylinder 7. Code set when injector flow or measured injection parameters fall below expected thresholds for the operating conditions.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1
LAND ROVER 2015 Discovery Sport HSE
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
