The Service Engine Soon light popped on last week on my 328i x-drive E91 with 131k miles. Codes indicated the upstream oxygen sensors so replaced them. Got it done last night late so only cleared the codes and have not gone for a drive yet to see if codes won't reappear. Planning to do the transmission service today - full service, dropping pan and replacing filter. Hope it is not too much of a mess.
-K9Leader, Newark DE
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