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C1142 — Failure in the absence of the tooth of the tone ring of the wheel speed sensor right front

Detailed page for trouble code C1142.

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Code

C1142

LAND ROVER C — Chassis

Failure in the absence of the tooth of the tone ring of the wheel speed sensor right front

Brand: LAND ROVER
Views: UK: 10 EN: 48 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Physical damage or missing tooth on the right-front tone ring (corrosion, crack, impact)
  • Contaminant buildup or heavy rust on the tone ring preventing proper sensing
  • Incorrect air gap or misalignment between sensor and tone ring
  • Failed or damaged wheel speed sensor (Hall/inductive) on right front
  • Damaged wiring, short, open or corroded connector to the sensor
  • Excessive wheel bearing play causing tone ring movement

Symptoms

  • ABS and/or traction control (ESP) warning lamp illuminated
  • ABS/ESP functions disabled for that wheel — reduced braking/traction control
  • Intermittent or zero wheel speed reading for right-front in live data
  • Possible ABS pulsation, unusual brake feel during ABS events
  • Diagnostic trouble code C1142 stored; related faults may appear (wheel speed plausibility)

What to check

  • Read and record all stored ABS/ESP codes and freeze frame data with a capable scan tool
  • Visually inspect the right-front wheel, hub, tone ring and sensor for physical damage, missing teeth, rust or heavy contamination
  • Inspect sensor mount and confirm sensor is seated and gap is within specification
  • Check connector and wiring for corrosion, damage, or poor contacts; wiggle test while observing live data
  • Measure sensor resistance/continuity if specified by service info (compare to spec)
  • Back-probe sensor supply/reference and ground (if active sensor) to verify proper supply voltage

Signal parameters

  • Active (Hall) sensor: digital square wave ~0–5 V (subject to manufacturer reference voltage); pulses per wheel rotation equal to tone ring tooth count
  • Passive (inductive) sensor: AC sine/sinusoidal pulses; amplitude increases with wheel speed (typical millivolts to a few volts AC)
  • Pulse frequency = (tooth count) × (wheel RPM / 60). Example: 48-tooth ring at 600 RPM = 480 Hz
  • Expected steady, regular pulse train with equal pulse spacing; missing tooth appears as an irregular or absent pulse
  • Typical diagnostic: consistent amplitude and timing across pulses; large dropouts or missing pulses indicate physical tooth loss, sensor or wiring issues

Diagnostic algorithm

  1. Connect a diagnostic scan tool. Read/record codes, live wheel speed data and freeze frame. Clear codes and attempt to re-create the fault with a short test drive or wheel spin.
  2. Perform a visual inspection of the right-front wheel, hub and tone ring for missing or damaged teeth, heavy corrosion, weld splatter, or debris on the ring or sensor tip. Check sensor mounting and air gap per spec.
  3. Inspect the sensor connector and wiring harness for corrosion, bent pins, chafing, or breaks. Repair or secure any wiring issues, then re-check for codes.
  4. With the wheel off the ground, spin the wheel and monitor the wheel-speed channel for the right front on the scan tool or oscilloscope. Look for missing pulses or irregular waveform matching a missing tooth.
  5. If waveform shows missing/irregular pulses, remove the wheel/hub assembly to inspect the tone ring closely. Measure the tone ring tooth count and look for cracks or missing teeth.
  6. Check sensor resistance/continuity if applicable and verify supply/reference voltage to the sensor. Replace the sensor if out of specification.
  7. Repair or replace the tone ring or hub assembly if teeth are damaged or incorrect. Replace sensor if damaged or producing incorrect signal. Repair wiring/connectors as needed.
  8. After repairs, clear codes and perform road test with live data to confirm steady wheel-speed signal and that no C1142 or related codes return.

Likely causes

  • Damaged or missing tooth(s) on the tone ring at the right-front hub
  • Sensor-to-ring air gap excessive or sensor knocked out of position
  • Contamination (metal debris, rust, grease) on the tone ring or sensor tip
  • Open/short/corroded connector or damaged harness to the right-front sensor
  • Failed right-front wheel speed sensor

Fault status

⚠️ Status
C1142 — Right-front wheel speed tone ring tooth absence/fault. The ABS/ESP controller detected missing or unreadable pulse(s) from the right-front wheel speed sensor (tone ring). This stores a fault and illuminates the ABS/ESP warning lamp; the affected wheel speed input is considered unreliable until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

C1142

MERCEDES-BENZ C — Chassis

ABS Lateral Acceleration Sensor Open/Shorted

Views: UK: 14 EN: 52 RU: 42
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Physical damage or missing tooth on the right-front tone ring (corrosion, crack, impact)
  • Contaminant buildup or heavy rust on the tone ring preventing proper sensing
  • Incorrect air gap or misalignment between sensor and tone ring
  • Failed or damaged wheel speed sensor (Hall/inductive) on right front
  • Damaged wiring, short, open or corroded connector to the sensor
  • Excessive wheel bearing play causing tone ring movement

Symptoms

  • ABS and/or traction control (ESP) warning lamp illuminated
  • ABS/ESP functions disabled for that wheel — reduced braking/traction control
  • Intermittent or zero wheel speed reading for right-front in live data
  • Possible ABS pulsation, unusual brake feel during ABS events
  • Diagnostic trouble code C1142 stored; related faults may appear (wheel speed plausibility)

What to check

  • Read and record all stored ABS/ESP codes and freeze frame data with a capable scan tool
  • Visually inspect the right-front wheel, hub, tone ring and sensor for physical damage, missing teeth, rust or heavy contamination
  • Inspect sensor mount and confirm sensor is seated and gap is within specification
  • Check connector and wiring for corrosion, damage, or poor contacts; wiggle test while observing live data
  • Measure sensor resistance/continuity if specified by service info (compare to spec)
  • Back-probe sensor supply/reference and ground (if active sensor) to verify proper supply voltage

Signal parameters

  • Active (Hall) sensor: digital square wave ~0–5 V (subject to manufacturer reference voltage); pulses per wheel rotation equal to tone ring tooth count
  • Passive (inductive) sensor: AC sine/sinusoidal pulses; amplitude increases with wheel speed (typical millivolts to a few volts AC)
  • Pulse frequency = (tooth count) × (wheel RPM / 60). Example: 48-tooth ring at 600 RPM = 480 Hz
  • Expected steady, regular pulse train with equal pulse spacing; missing tooth appears as an irregular or absent pulse
  • Typical diagnostic: consistent amplitude and timing across pulses; large dropouts or missing pulses indicate physical tooth loss, sensor or wiring issues

Diagnostic algorithm

  1. Connect a diagnostic scan tool. Read/record codes, live wheel speed data and freeze frame. Clear codes and attempt to re-create the fault with a short test drive or wheel spin.
  2. Perform a visual inspection of the right-front wheel, hub and tone ring for missing or damaged teeth, heavy corrosion, weld splatter, or debris on the ring or sensor tip. Check sensor mounting and air gap per spec.
  3. Inspect the sensor connector and wiring harness for corrosion, bent pins, chafing, or breaks. Repair or secure any wiring issues, then re-check for codes.
  4. With the wheel off the ground, spin the wheel and monitor the wheel-speed channel for the right front on the scan tool or oscilloscope. Look for missing pulses or irregular waveform matching a missing tooth.
  5. If waveform shows missing/irregular pulses, remove the wheel/hub assembly to inspect the tone ring closely. Measure the tone ring tooth count and look for cracks or missing teeth.
  6. Check sensor resistance/continuity if applicable and verify supply/reference voltage to the sensor. Replace the sensor if out of specification.
  7. Repair or replace the tone ring or hub assembly if teeth are damaged or incorrect. Replace sensor if damaged or producing incorrect signal. Repair wiring/connectors as needed.
  8. After repairs, clear codes and perform road test with live data to confirm steady wheel-speed signal and that no C1142 or related codes return.

Likely causes

  • Damaged or missing tooth(s) on the tone ring at the right-front hub
  • Sensor-to-ring air gap excessive or sensor knocked out of position
  • Contamination (metal debris, rust, grease) on the tone ring or sensor tip
  • Open/short/corroded connector or damaged harness to the right-front sensor
  • Failed right-front wheel speed sensor

Fault status

⚠️ Status
C1142 — Right-front wheel speed tone ring tooth absence/fault. The ABS/ESP controller detected missing or unreadable pulse(s) from the right-front wheel speed sensor (tone ring). This stores a fault and illuminates the ABS/ESP warning lamp; the affected wheel speed input is considered unreliable until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

C1142

Other C — Chassis

Wheel Speed Sensor RF Tone Ring Tooth Missing Fault

Brand: Other
Views: UK: 18 EN: 58 RU: 61
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Physical damage or missing tooth on the right-front tone ring (corrosion, crack, impact)
  • Contaminant buildup or heavy rust on the tone ring preventing proper sensing
  • Incorrect air gap or misalignment between sensor and tone ring
  • Failed or damaged wheel speed sensor (Hall/inductive) on right front
  • Damaged wiring, short, open or corroded connector to the sensor
  • Excessive wheel bearing play causing tone ring movement

Symptoms

  • ABS and/or traction control (ESP) warning lamp illuminated
  • ABS/ESP functions disabled for that wheel — reduced braking/traction control
  • Intermittent or zero wheel speed reading for right-front in live data
  • Possible ABS pulsation, unusual brake feel during ABS events
  • Diagnostic trouble code C1142 stored; related faults may appear (wheel speed plausibility)

What to check

  • Read and record all stored ABS/ESP codes and freeze frame data with a capable scan tool
  • Visually inspect the right-front wheel, hub, tone ring and sensor for physical damage, missing teeth, rust or heavy contamination
  • Inspect sensor mount and confirm sensor is seated and gap is within specification
  • Check connector and wiring for corrosion, damage, or poor contacts; wiggle test while observing live data
  • Measure sensor resistance/continuity if specified by service info (compare to spec)
  • Back-probe sensor supply/reference and ground (if active sensor) to verify proper supply voltage

Signal parameters

  • Active (Hall) sensor: digital square wave ~0–5 V (subject to manufacturer reference voltage); pulses per wheel rotation equal to tone ring tooth count
  • Passive (inductive) sensor: AC sine/sinusoidal pulses; amplitude increases with wheel speed (typical millivolts to a few volts AC)
  • Pulse frequency = (tooth count) × (wheel RPM / 60). Example: 48-tooth ring at 600 RPM = 480 Hz
  • Expected steady, regular pulse train with equal pulse spacing; missing tooth appears as an irregular or absent pulse
  • Typical diagnostic: consistent amplitude and timing across pulses; large dropouts or missing pulses indicate physical tooth loss, sensor or wiring issues

Diagnostic algorithm

  1. Connect a diagnostic scan tool. Read/record codes, live wheel speed data and freeze frame. Clear codes and attempt to re-create the fault with a short test drive or wheel spin.
  2. Perform a visual inspection of the right-front wheel, hub and tone ring for missing or damaged teeth, heavy corrosion, weld splatter, or debris on the ring or sensor tip. Check sensor mounting and air gap per spec.
  3. Inspect the sensor connector and wiring harness for corrosion, bent pins, chafing, or breaks. Repair or secure any wiring issues, then re-check for codes.
  4. With the wheel off the ground, spin the wheel and monitor the wheel-speed channel for the right front on the scan tool or oscilloscope. Look for missing pulses or irregular waveform matching a missing tooth.
  5. If waveform shows missing/irregular pulses, remove the wheel/hub assembly to inspect the tone ring closely. Measure the tone ring tooth count and look for cracks or missing teeth.
  6. Check sensor resistance/continuity if applicable and verify supply/reference voltage to the sensor. Replace the sensor if out of specification.
  7. Repair or replace the tone ring or hub assembly if teeth are damaged or incorrect. Replace sensor if damaged or producing incorrect signal. Repair wiring/connectors as needed.
  8. After repairs, clear codes and perform road test with live data to confirm steady wheel-speed signal and that no C1142 or related codes return.

Likely causes

  • Damaged or missing tooth(s) on the tone ring at the right-front hub
  • Sensor-to-ring air gap excessive or sensor knocked out of position
  • Contamination (metal debris, rust, grease) on the tone ring or sensor tip
  • Open/short/corroded connector or damaged harness to the right-front sensor
  • Failed right-front wheel speed sensor

Fault status

⚠️ Status
C1142 — Right-front wheel speed tone ring tooth absence/fault. The ABS/ESP controller detected missing or unreadable pulse(s) from the right-front wheel speed sensor (tone ring). This stores a fault and illuminates the ABS/ESP warning lamp; the affected wheel speed input is considered unreliable until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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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.

199,00 UAH
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
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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.

199,00 UAH
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
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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.

199,00 UAH
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
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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.

199,00 UAH
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
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