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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 01-01-2005, 09:57 AM   #1 (permalink)
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My check engine light has come on numerous times in the last year. Mechanic says the computer indicates a problem with the catalytic converter, but does not really seem to believe his own diagnosis.

If I run the vehicle at highway speeds, it sometimes resets on its own, and I keep driving. No change in performance with or without the light on.

Any ideas.
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Old 01-01-2005, 11:56 AM   #2 (permalink)
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Nobody here will be able to offer much help without some additional info.
Do you know what codes specifically were stored in the control module?
Intermittent problems can be difficult to find and if the car runs perfect then all the technician can do is try to evaluate the codes that are stored in the system and make an educated guess or wait for the problem to replicate and then do hard component testing.
If your technician doesnt seem competent then you can always try a different one, or if you trust him maybe make arrangements to leave the car with him for a few days to try and replicate the problem.

Personally I wouldnt replace an expensive component (cat converter) on a guess I would want some concrete evidence that it is failing.

Good luck

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