P2098 BMW Oxygen Sensor Before Catalytic Converter 2 Trim Control

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

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P2098 BMW OBD Code Description

Post catalyst fuel trim system too lean bank 2