N63R - Service Engine Soon Light with Oxygen Sensor faults Stored. The Service Engine Soon light is on (MIL) with either, or both, of the following oxygen sensor faults stored: 12A308 - Oxygen sensor after catalytic converter, signal: too slow from rich to lean 12A408 - Oxygen sensor 2 after catalytic converter, signal: too slow from rich to lean DME software diagnostic function.
