C1142 — Wheel Speed Sensor RF Tone Ring Tooth Missing Fault #

Note: The description of DTC C1142 may vary depending on the vehicle manufacturer. Always refer to OEM (Original Equipment Manufacturer) documentation for exact wording.

• Nissan: C1142 – ABS Wheel Sensor RF Tone Ring Tooth Missing
• Infiniti: C1142 – Front Right Wheel Speed Sensor Signal: Tone Ring Missing Teeth
• Renault: C1142 – Wheel Speed Sensor Front Right – Tone Wheel Fault

Summary of DTC C1142 #

The C1142 diagnostic trouble code points to an issue with the right front (RF) wheel speed sensor system, specifically indicating a problem with the tone ring—the toothed ring that passes in front of the sensor. This code means that the vehicle’s anti-lock brake system (ABS) control module has detected one or more missing or damaged teeth on the tone ring, leading to inconsistent or faulty wheel speed readings. As the ABS relies on accurate input from all wheel speed sensors to function safely, this fault can jeopardize brake system performance, especially in emergency or slippery conditions. Timely diagnosis and repair are critical to maintain both safety and system reliability.

Common Symptoms for Code C1142 #

A missing or damaged tooth on the tone ring can cause a range of symptoms, some subtle and others more obvious. Most drivers will notice changes in ABS performance or warning lights on the dashboard. Here are the typical signs:

• ABS warning light illuminated on the dashboard
• Traction control or stability control warning lights (if equipped)
• Pulsating brake pedal during moderate or hard braking
• Potential loss of anti-lock braking function, especially on slippery surfaces
• Inconsistent speedometer readings (rare, but possible if speed signal is shared)

Probable Causes of C1142 (in order of likelihood) #

Several factors can lead to a C1142 code. In most cases, the problem is mechanical, but electrical issues or wiring damage can also play a part. Below are the most common causes listed by how often they occur:

1. Damaged or missing teeth on the RF tone ring (due to corrosion, impact, or manufacturing defect)
2. Broken, cracked, or excessively dirty tone ring
3. Improperly installed or misaligned wheel speed sensor
4. Debris lodged between the sensor and tone ring
5. Faulty right front wheel speed sensor
6. Damaged wiring or connector at the sensor
7. Fault in the ABS control module (rare)

Step-by-Step Diagnosis for C1142 #

Diagnosing C1142 requires a systematic approach to rule out each potential cause, starting from the most likely and accessible. Here’s a proven process:

• 1. Use an advanced scan tool to confirm the code and check ABS data for the right front wheel speed sensor.
• 2. Perform a thorough visual inspection of the RF tone ring through the wheel hub or by removing the wheel and caliper if necessary.
• 3. Look for missing, chipped, or corroded teeth on the tone ring.
• 4. Inspect the area for debris, rust, or foreign objects between the sensor and the tone ring.
• 5. Check the wheel speed sensor mounting and alignment—ensure it is secure and properly spaced from the tone ring.
• 6. Test the RF wheel speed sensor electrically with a multimeter (check resistance and output signal as the wheel spins).
• 7. Examine the sensor wiring harness and connector for signs of wear, corrosion, or damage.
• 8. If all else checks out, consider ABS module diagnostics or consult OEM service data for further steps.

Possible Repairs for C1142 #

Once the root cause is identified, the appropriate repair can be made. Here are the most common fixes, each corresponding to a typical cause:

• Replace the right front tone ring if teeth are missing or damaged
• Clean the tone ring and sensor area to remove debris or rust buildup
• Reinstall or realign the wheel speed sensor if it is out of position
• Replace the right front wheel speed sensor if it is faulty or damaged
• Repair or replace damaged wiring or connectors at the sensor location
• Replace the ABS control module (only if all other causes are eliminated and confirmed by OEM procedures)

Is It Safe to Drive with Code C1142? #

Driving with a C1142 code is not recommended for normal use. While the vehicle may appear to operate normally under regular conditions, the ABS system may be partially or fully disabled. This means that in an emergency stop or on slippery roads, you may lose anti-lock braking and stability control—significantly increasing the risk of skidding or loss of control. Have the issue inspected and repaired as soon as possible to ensure full braking safety.

Vehicles Most Commonly Affected by C1142 #

While this code can appear on various makes and models, it is most frequently reported on vehicles equipped with tone rings as part of their ABS system, especially where exposed to road salt or debris. Commonly affected models include:

• Nissan Altima (various years)
• Nissan Rogue
• Infiniti G35
• Renault Koleos
• Nissan X-Trail
• Other Nissan/Infiniti/Renault models with similar ABS architecture

Frequent Mistakes & Best Practices with C1142 #

Misdiagnosis can lead to unnecessary part replacements or recurring issues. To avoid common pitfalls and ensure a lasting repair, keep these tips in mind:

• Do not replace the wheel speed sensor without first inspecting the tone ring; a missing tooth will trigger the code even with a new sensor.
• Always clean the area before inspection—dirt and rust can hide damage.
• Check sensor alignment and mounting depth per OEM specs.
• Use only OEM or high-quality parts for repairs, particularly for sensors and tone rings.
• Reset the ABS system with a scan tool after repairs to confirm the issue is resolved.

Express FAQ for Code C1142 #

Is a damaged tone ring dangerous?
Yes, because it can disable the ABS and stability systems, increasing your risk during emergency braking or on wet/icy roads.

Can I clear the code and keep driving?
Clearing the code without fixing the root cause will not restore ABS function. The warning and risk will return as soon as the system re-detects the fault.