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      09-22-2013, 08:35 PM   #13
nekky
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Drives: '16 328d M Sport Touring
Join Date: May 2011
Location: Vancouver

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Reviving this thread because I think I have found part of my problem of rough running/idle issues, etc. My car finally threw an SES light and when scanned, read out two fault codes: P1633 and P2629. The P1633 is something to do with throttle (have tried replacing TPS under the intake manifold with a known working unit from my father's car, and felt zero difference). The P2629 is O2 sensor I believe, and from what others are saying on the forum here regarding the symptoms, I'm thinking that it's the problem.

IIRC, the code is for the primary O2 sensors in the USDM headers. Can anyone share info as to whether I should go ahead, bite the bullet, and replace *both* sensors to the tune of $400? Anything else I should check first?

Thanks in advance!
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