Chassis, generic

C0667 Right Rear Wheel Speed Sensor B Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

C0667 reports that the second right rear speed signal arrives but is not plausible, while the circuit itself is fine. No maker documents the code. At the rear axle the air gap can change while driving. A Ford patent observes that on semi-floating axles the shaft can deflect by more than 0.5 mm, enough to push a Hall sensor out of range of its tone ring so the signal turns wrong or vanishes, especially on the more heavily loaded side in a turn. On non-driven rear axles with two tapered roller bearings, Schaeffler requires the bearing clearance to be set by the maker's specification; too much play spreads the load unevenly and makes the hub less rigid, which can likewise disturb the gap. Faults that come with load or cornering point in this direction.

Likely causes

Worn or wrongly adjusted wheel bearing letting the gap vary
Axle shaft deflection under load or a bent shaft
Sensor not fully seated in its bore

Symptoms

  • Warning mainly with load, towing or in fast bends
  • Stability control functions temporarily withdrawn

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–800
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

rr wss btone ring

Related codes

C0666C066AC066BC0513C0660

References: patents.google.com, schaeffler.com.