oxygen sensors B1/S2, B2/S2
09-19-2006, 05:07 AM
#13
Oh, and if you've never done them, I'd do the pre-cat ones, while you're in O2 sensor mode.
The pre-cat ones made a small but noticeable performance improvement, when I did mine. A long-time Audi mechanic friend clued me into that.
The pre-cat ones affect performance. The post-cat ones primarily affect emissions.
The pre-cat ones affect performance. The post-cat ones primarily affect emissions.
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