Hi guys,
I have a problem that I have had for a while and im starting to get a bit desperate with it really. I have fault codes P0136 and P0141, related to the cars o2 circuits. I have replaced the original downsteam o2 sensor with a new Bosh one, but the problem still persists. I took the car to BMW and they did a diagnosis, stating that it needs a new sensor, but obviously I have already put a new one in. Is it possible that only BMW will have some kind of sensor that works with my car and that an after market one like the one i bought (new from eurocar parts) wont work?
They stated that if they change the sensor and this does not fix the problem the car may need a new DMU, which will costs £1000 plus, and i refuse to believe my car needs this as it runs perfectly and achieves great mpg.
Any help would be really appreciated.