I'm an original owner for a 2001 330i. And up until now it's been perfect, minor maintenance, a couple replaced sensors but otherwise it's been great. But the car is finally starting to show some age.

I have a diagnostic computer so i have access to all of the car's internal information and the ecu keeps tripping one of the hidden internal errors which dont' actually turn on the engine light. The errors are for both lambda sensors reaching their full rich adjustment. I've recently replaced the spark plugs (car is at 75k) thinking that might do it, but no dice. Is this a air flow sensor issue? Or do I have an air leak at the intake or something like that.

I'd appreciate any ideas.

Eugene
SESF Sr. Developer

1986 L7 Auto.
1987 L6 5-Speed
1987 L6/M5 S38-B36 5-Speed
1994 540i Manual (converted with '02 M5 6 speed and '98 540 flywheel/clutch)
2001 330i Auto

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