OBD-II code · Chassis
C0030 Left Front Wheel Speed Sensor Circuit Range/Performance
The signal from the left front wheel speed sensor is implausible relative to the other wheels. Typical causes are excessive air gap, contaminated tone ring or partial sensor failure.
Is it safe to drive with C0030?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyMetal debris on tone ring (magnetic encoder)
- PossibleSensor air gap too large
- PossibleSensor intermittent at temperature
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Wheel Speed Sensor Fl, Tone Ring, Hub Bearing
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.