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Discussion Starter · #1 ·
My S6 started running poorly the other day, and I finally got a chance to look at it. The only fault code it had was 00525 (my scanner is not the newest or best) and it said brake o2 sensor no signal. Can a bad o2 sensor cause rough running? I am thinking it is doubtful.

I have replaced the spark plugs within the last 10k miles. I have a spare ignition module, and I tried that, and it didn't help.

Any suggestions?
Thanks guys
 

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yes a bad 02 can cause the car to run like shit. considering our cars only have the one 02 sensor id bet thats the problem.
 
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