N63T: Oxygen Sensor Internal Resistance Faults

Bulletin number

B121615

Component

Engine and engine cooling: exhaust system: emission control: catalytic convertor

Summary

N63T: Oxygen Sensor Internal Resistance Faults. The Service Engine Soon light comes on with either or both of the following faults stored in the DME memory: ? 12B701 - Oxygen sensor heating after catalytic converter, function: Internal resistance too high ? 12B801 - Oxygen sensor heating after catalytic converter 2, function: Internal resistance too high The engine operation and performance are not affected. The DME diagnosis for the post catalyst oxygen sensor(s) is too sensitive.

Owners of these vehicles have filed 263 complaints in the engine category.