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      12-03-2012, 08:34 PM   #3
Mike Benvo
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Drives: 08 E90 M3 / 400whp Turbo 7
Join Date: Apr 2008
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1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
2008 BMW M3  [5.00]
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Quote:
Originally Posted by signes View Post
A leak would generate a CEL, but you should get it fixed regardless. Where is it? You have both the primary and secondary stock cats still on? You could also have a faulty O2 sensor among about 1000 other reasons.
A leak in the exhaust system may not trigger any CEL - depends where it is.

You probably have an o2 sensor that has a problem, if you're confident there isn't a leak somewhere.
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