P0159 sensor code

[GraemeH]

Folks,

I've got a fault code "p0159 oxygen sensor bank 2 sensor 2" but I don't know which sensor is bank 2 sensor 2 as I can find 3 sensors in the engine bay (2 precat and 1 post) also a further sensor halfway down the exhaust under the car.

Someone out there must know which is which, please help! Its a 2007 2.0l e85

 

[GaryT]

There are four O2 sensors, 2 x pre cat, 2 x post cat.
possible causes:
Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

 

[GraemeH]

There are four O2 sensors, 2 x pre cat, 2 x post cat.
possible causes:
Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

My car is 2.0l 4 pot the diagram you've shown is a 6 pot but would I be correct in saying that my cylinder 3 and 4 (the 2 nearest the bulkhead are bank 2?

 

[GaryT]

Sorry i should have noticed
No it looks like the cylinders are mixed from the image below

http://bmwfans.info/parts-catalog/E85/Europe/Z4_2.0i-N46/R-N/feb2007/browse/exhaust_system/

 

[GraemeH]

Sorry i should have noticed
No it looks like the cylinders are mixed from the image below

http://bmwfans.info/parts-catalog/E85/Europe/Z4_2.0i-N46/R-N/feb2007/browse/exhaust_system/

Looks like 1 and 4 are joined and 2 and 3 are joined. But I'm still no further forward looking for bank 2 sensor 2