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Problem was the warning light would come on when the engine was idling for example at traffic lights, roundabouts, opening the garage door etc. Local garage fitted a new fuel filter. Did 20 miles, light comes on. Garage said fit a new air mass sensor. I asked will it cure the problem? They said it might, but at £200 + it was too much of a risk. I eventually found the problem, it was a very sooty and sticky throttle position sensor/valve (on the front of the throttle body) a quick clean, and the car is running even better.
 

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Hello dear i am new to this forum, i wanted to ask you a question becuase i got a 2002 316i saloon recenetly and the engine light is on too and sometime it goes off, is that the problem you had which was sorted out by a cleaning?
thank you
 
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