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      11-05-2012, 09:50 AM   #5
135Pats
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Drives: 135i
Join Date: May 2012
Location: Maryland

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the shaking at startup could be bad or incorrectly installed o2s. theyre very sensitive so if you bumped them or dropped them, they could be broken. pre-cat o2s help regulate afrs, without them your car wont be happy at all, esp when its not warmed up. Its not a critical failure like a water pump, but you want to get it taken care of.
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