Thread: o2 sensor
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Old 09-13-2013, 08:34 AM   #3
HinshawWRX
Medium Frank
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Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

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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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