S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

How do you run testpipes and not set off secondary o2 efficiency codes?

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Old 12-05-2005, 08:42 PM
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Default Wicked did some work on my car in October, haven't thrown a CEL since I got it

back. Was under the car yesterday, and it appears Mike installed some kind of spacer between the O2 sensor and O2 bung. I just glanced at it when I was under there for a pressure test.

If this is the case, thanks Mike and Wicked. Has been working great, No CEL, but I do get a couple of warmup DTC's (fairly common), but they never throw a CEL.

Still running test pipes of course
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