Thread: Strange codes?
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Old 12-24-2012, 10:30 AM
pshovest pshovest is offline
BMW CCA 69606
Location: DE
Join Date: Dec 2009
Posts: 1,364
Mein Auto: '10 535i '08 X5 '00 528i
If car originally had cats, then it likely had pre-cat O2 sensors. Pre-cat O2 sensors are essential for cats to work. Perhaps they were removed, perhaps you can't find them, perhaps the misfire codes, which will disable fuel injector(s) causing lean exhaust conditions are causing issues for the O2 sensors. Do you have a check engine light? Does it come on in key position 2? Perhaps light was removed and codes have been present since cats & O2 sensors were removed.
Post the last 7 digits of VIN and we can tell you what you should have.

Originally Posted by E39 touring View Post
Have checked the car and crawled underneath,the cat has been removed as already mentioned,there is a welded in replacement pipe as I mentioned also,went all the way thru the system from end to end any there is no o2 sensor anywhere,

Last edited by pshovest; 12-24-2012 at 10:33 AM.
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