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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 03-06-2011, 07:16 PM
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check engine light

Recently my engine lights was on, on my OBDII showed it is a p0420 and p0430 code referring to a catalyst system problem on bank 1 and 2.
I got it cleared and drove it for a bit and it passed on a smog check, but after a week of driving the engine light went back on!
I just noticed that everytime i use my AC that is the only time that my idle start getting rough, so my question is does it really affect that use of an AC? I just want to know if I really need to go to the expensive rapair like changing cats or replacing my 4 o2 sensors? Any idea to go on a low budget repair first?
Thank you..
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#2 (permalink) Old 03-21-2011, 06:59 AM
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If you are really having Cat or O2 sensor probs, there is no cheap fix. Sorry. You are having engine peformance issues which is why the idle gets all weird when you turn on the a/c. YOu need to get this looked at and repair ASAP. You will be much happier with the car once these repairs are done.

1997 E36 M3 - running stocker style right now...
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