Code
C1142
LAND ROVER
C — Chassis
Failure in the absence of the tooth of the tone ring of the wheel speed sensor right front
Views:
UK: 10
EN: 48
RU: 30
AI status
Completed
Completed
100%
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
- 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.
- 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.
- 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.
- 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.
- 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.
- Check sensor resistance/continuity if applicable and verify supply/reference voltage to the sensor. Replace the sensor if out of specification.
- 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.
- 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
Completed
100%
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
- 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.
- 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.
- 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.
- 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.
- 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.
- Check sensor resistance/continuity if applicable and verify supply/reference voltage to the sensor. Replace the sensor if out of specification.
- 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.
- 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
Views:
UK: 18
EN: 58
RU: 61
AI status
Completed
Completed
100%
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
- 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.
- 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.
- 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.
- 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.
- 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.
- Check sensor resistance/continuity if applicable and verify supply/reference voltage to the sensor. Replace the sensor if out of specification.
- 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.
- 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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