Help please -engine warning light [exhaust emissions value]

Scooba_Steve said:
If it's a sensor and it's plugged into the exhaust manifold pre- or post- cat then Lambda/O2 sensor they are essentially the same thing.

That's how I see it and why I suggested as a probable cause as they seem to fail quite often.

http://en.wikipedia.org/wiki/Oxygen_sensor
 
So its on the precat Lambda sensor -the NOX sensor is fine
Will know more on Monday when they re-run the diagnostics with new Lambda in situ
Apparently the BMW genuine part costs 250 and 150 is labour -which sounds OK
 
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