C066CRight Rear Wheel Speed Sensor B Incorrect Component Installed
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- C066C indicates that the part on the second right rear speed channel differs from the one the module is set up for. No carmaker documents the code or its detection logic. Parts for the rear hub come in several versions: Schaeffler lists wheel bearings both with a multipole encoder and without one, plus third-generation units with the sensors built in, so a hub from the wrong range may lack the encoder or the second sensor altogether. Orientation matters too. NSK advises identifying the encoder side with a magnetic test card and fitting the bearing so that this face ends up next to the sensor; NTN-SNR suggests a paper clip for the same check. Since the code points to the part rather than to wiring, the fitted hub and sensor numbers are compared with the vehicle's specification first.
- What you may notice
- Warning appears right after work on the right rear hub
- Redundant or automated brake functions not available
- Likely causes
- LikelyHub or bearing from a variant without encoder or second sensor
- PossibleBearing fitted with the encoder side facing away from the sensor
- PossibleSensor of another type or vehicle fitted
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.