[Aycee]

The 120i is playing up, engine light comes on every once in a while, can be reset but comes on again 1 or 2 days later.
On Carly I get the following:
002AF0 Nitrogen Oxide sensor Heating
002AF4 Nitrogen Oxide sensor Electrically
002AF2 Nitrogen Oxide sensor Lambda
002AF6 Nitrogen Oxide sensor Power supply

I have looked on Real OEM and there seem to be 3 lambda's fitted.
Lambda probe black 11787539123
Regulating Lambda probe 11787569930
Lambda Monitor sensor 11787569968

Have searched around and see that these fail and are replaced but no one mentions which one. Is it 'Lambda Monitor sensor 11787569968' that is the problem? Is there a way of finding out which one is faulty or prone to failure. Wanted to check before splashing out on the wrong one!

 

[Aycee]

Have been doing a little more research and it seems that it may not be the lambda sensors after all but the NOX sensor. It's an expensive part so I need to make sure that's the problem!
There's some good info here. The error codes seem to match up with what I'm getting on two different scanners.

http://eleganz-durch-technik.blogspot.co.uk/2014/10/nox-sensor-replacement.html

 

[Hendy]

http://www.babybmw.net/viewtopic.php?t=82542

BMW e87 2.0 2011

 

[Aycee]

Thanks for that, should have searched for NOX instead of Lambda

 

[Mnk]

Did these faults get fixed?

 

[Aycee]

Yes, replaced the NOX sensor and cleared the codes. Been running fine for over a year