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OBD Code C1142

Wheel Speed Sensor RF Tone Ring Tooth Missing Fault

CodeC1142
DescriptionWheel Speed Sensor RF Tone Ring Tooth Missing Fault
SystemChassis

What Does C1142 Mean?

Wheel Speed Sensor RF Tone Ring Tooth Missing Fault. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the chassis.

Code Breakdown

C = Chassis code

1 = Manufacturer-specific

How to Fix C1142

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Inspect the speed sensor connector and wiring for damage or corrosion.
  2. Test the sensor resistance with a multimeter — compare to spec.
  3. Check the sensor reluctor ring or tone wheel for damage or debris.
  4. Clean the sensor tip of any metallic debris.
  5. Verify the air gap between the sensor and reluctor ring.
  6. Replace the sensor if resistance is out of specification.
  7. Clear codes and verify speedometer and shift points are correct during a test drive.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is C1142 serious?

Yes — C1142 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear C1142 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix C1142?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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