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

The code description may vary depending on the vehicle manufacturer. Always refer to OEM service information for the exact wording.

• Wheel Speed Sensor RF Tone Ring Tooth Missing Fault (Generic/OEMs)
• Right Front Wheel Speed Sensor: Tone Ring Missing Tooth Detected (Nissan, Infiniti)
• ABS Sensor RF: Tone Wheel Tooth Missing (Ford)
• FR Wheel Speed Sensor: Tone Wheel Malfunction (Toyota, Lexus)

Summary of code C1142 #

Diagnostic Trouble Code (DTC) C1142 indicates that the right front (RF) wheel speed sensor has detected a missing tooth or irregularity on its associated tone ring. The tone ring, sometimes referred to as a reluctor ring, is a toothed metal ring mounted on the wheel hub or axle that works in conjunction with the wheel speed sensor—a critical component of the Anti-lock Braking System (ABS). Anomalies on the tone ring, such as a missing or damaged tooth, disrupt the sensor’s signal, leading the ABS module to set this code. While this issue does not typically affect basic vehicle operation, it can compromise safety systems like ABS or traction control, especially in slippery driving conditions.

Common symptoms for code C1142 #

Drivers and technicians may notice a variety of symptoms when the C1142 code is present. These symptoms are often subtle at first but can become more pronounced depending on the severity of the tone ring defect. Key indicators include:

• ABS warning light illuminated on the dashboard
• Traction control or stability control warning lights may also appear
• Pulsation, vibration, or unusual feedback from the brake pedal during ABS operation
• ABS or traction control system deactivation
• Possible speedometer inaccuracies (rare, but possible on some models)
• No noticeable symptoms during normal driving in some cases

Likely causes for code C1142 #

Most cases of C1142 are related directly to the tone ring’s physical integrity or its relationship with the sensor. Based on field experience, the most common causes, ranked by frequency, are:

1. Damaged, cracked, or missing tooth/teeth on the RF wheel speed sensor tone ring
2. Excessive buildup of debris, rust, or dirt on the tone ring
3. Faulty or improperly installed RF wheel speed sensor
4. Improper air gap between the sensor and the tone ring due to mounting issues
5. Broken, corroded, or loose wiring/connectors at the RF wheel speed sensor
6. Incorrect or aftermarket axle/wheel hub not matching OEM tone ring specifications

Step-by-step diagnosis for code C1142 #

To accurately diagnose and confirm the cause of C1142, a systematic approach is best. Here’s a proven step-by-step method:

• Verify the code with a professional scan tool. Record freeze frame and other related codes.
• Visually inspect the right front wheel speed sensor and its wiring for obvious signs of damage, looseness, or corrosion.
• Remove the wheel (if needed) and carefully inspect the tone ring for missing, bent, or damaged teeth. Check for rust, debris, or cracks.
• Check the alignment/air gap between the sensor and the tone ring. Consult OEM specs for proper clearance.
• Test the RF wheel speed sensor output using a multimeter or oscilloscope. Look for signal dropouts or irregular waveforms when the wheel is rotated.
• If necessary, compare signals and tone ring condition with the left front wheel for reference.
• Check for recent repairs or replacements of axles, hubs, or aftermarket parts that may have introduced non-OEM tone rings.
• Clear the code, test drive the vehicle, and monitor ABS data to confirm repair.

Possible repairs for code C1142 #

Once the root cause is identified, repairs should target the specific fault area. Typical solutions include:

• Replace the tone ring if teeth are missing, cracked, or excessively worn
• Clean the tone ring and sensor mounting area to remove rust, dirt, or debris
• Replace the RF wheel speed sensor if it is faulty, damaged, or reading out of specification
• Repair or replace broken, corroded, or loose wiring/connectors at the sensor
• Correct any improper sensor installation or adjust the sensor-to-ring air gap per OEM specs
• Install OEM-compliant axles or hubs if incorrect aftermarket parts were used

Is it safe to drive with code C1142? #

Driving with code C1142 is possible, but not fully recommended. While the vehicle’s basic braking system will still function, the ABS and traction control systems may be disabled or unreliable. This increases the risk of wheel lockup or loss of control in slippery or emergency situations. For safety, repairs should be made as soon as possible, especially if warning lights are illuminated or if you notice any change in brake feel.

Vehicles most commonly affected by code C1142 #

C1142 appears most frequently on vehicles equipped with active ABS systems using dedicated tone rings and wheel speed sensors. It is particularly common among:

• Nissan Altima, Maxima, Rogue, Murano (2007–present)
• Infiniti G-Series, QX-Series (2008–present)
• Toyota Camry, Corolla, Highlander (2008–present)
• Lexus RX, ES series (2009–present)
• Ford Fusion, Escape (2010–present)
• Mazda CX-5, Mazda6 (2012–present)

Note: Other makes and models may also be affected. Always consult OEM service bulletins for the latest application data.

Common mistakes & best practices for code C1142 #

Misdiagnosis or incomplete repairs are common with this code. To achieve a reliable fix and avoid repeat visits, keep these best practices in mind:

• Do not replace the wheel speed sensor before inspecting the tone ring for damage or contamination
• Avoid using aftermarket axles or hubs with incorrect tone ring designs—always match OEM specifications
• Do not ignore minor rust or debris on the tone ring, as even slight contamination can trigger the code
• Always check the sensor’s air gap and mounting alignment after any repair or replacement
• Verify repairs with a scan tool and live sensor data, not just by clearing the code

Quick FAQ for code C1142 #

Here are quick answers to common questions about this code:

• Q: Can I just clear the code to fix the issue?
  A: Clearing the code without addressing the root cause will only temporarily turn off the warning light. The code will return as soon as the ABS module detects the fault again.
• Q: Is it expensive to fix a missing tone ring tooth?
  A: Costs vary. If only cleaning is needed, it’s minimal. If the tone ring or sensor is damaged, parts and labor can be moderate, but addressing it promptly prevents further issues with safety systems.