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      12-04-2012, 11:34 AM   #5
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Drives: Z4M - E90M3
Join Date: Nov 2007
Location: USA

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From experience with the E39, the codes that point to the O2 sensors are very non specific. After buying new sensors and having the problem and the codes come back, I found the intake camshaft position sensor and the idle control valve to be the culprits.
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