Thread: o2 sensor
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Old 09-13-2013, 09:34 AM   #3
Medium Frank
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
2013 Audi
A6 3.0T


The front or Bank 1 o2 sensor is the primary o2 and how your car calculates fuel trims. The rear o2 sensor checks for Cat efficiency and makes minor alterations in trims.

how do you need a new rear o2 sensor in a 2013? Why not warranty it?
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HinshawWRX is offline   Reply With Quote