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| Guest 
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			Hello. Just had to replace a faulty injector on my 325i but the engine is still rough on idle before evening out. The mechanic mentioned that the oxygen sensor was probably contaminated - will this wear off or I will I need to clean or replace the sensor now ? Thanks  __________________ This post was auto-generated based upon a question asked on our tech article page here: | ||
|  04-09-2014, 11:11 AM | 
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| Moderator Join Date: Jul 2012 Location: New England 
					Posts: 3,189
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			O2 should not cause rough running on one cylinder. I would check for a misfire on that cylinder, spark, fuel, compression.  - Nick | ||
|  04-09-2014, 11:11 AM | 
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