Possible causes
– Pre cat or downstream post cat o2 sensor harness is open or shorted
– Pre cat or downstream post cat o2 sensor circuit poor electrical connection
– Exhaust system leak
– Faulty pre cat or downstream post cat o2 sensor
– Pre cat or downstream post cat o2 sensor circuit poor electrical connection
– Exhaust system leak
– Faulty pre cat or downstream post cat o2 sensor
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P2098 BMW Description
Post catalyst fuel trim system too lean bank 2