C0518Left Front Wheel Speed Sensor - Mechanical
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- C0518 points to a mechanical rather than electrical problem at the left front speed sensor: wrong part, wrong position, a damaged or soiled encoder, or play in the hub. No manufacturer documents this exact code publicly; GM's tables and Mitsubishi's index file such faults under range or correlation codes instead. The mechanics are well described elsewhere. GM bulletin PIT5950 for Silverado and Sierra 1500 warns that left and right front sensors look alike, that a swapped part keeps setting codes, and that the flat side of the tip must face the magnetic encoder ring on the wheel bearing. An Infiniti bulletin asks technicians to check the sensor head and the encoder for dirt, cracks, missing teeth, corrosion and looseness, since contamination alone can cause intermittent faults.
- What you may notice
- ABS and stability lamps on, often recurring after a repair
- Uneven or missing left front speed reading at low speed
- Likely causes
- LikelyMagnetic encoder or tone ring dirty, cracked or missing teeth
- PossibleSensor for the other side fitted or tip turned away from the encoder
- PossibleWorn or loose left front hub bearing changing the air gap
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.