Quote:
Originally Posted by tom.kutches@gmail.com
So, did the P0431 code go away due to the new o2 sensor (if so before or after the front pre-cat), or due to the anti-foulers?
TomK
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The P0431 error went away with the new O2 sensor. Mine was after the pre-cats. I was going to install the Bosch sensor into the anti-foulers, but it wouldn't fit. Apparently, the diameter of the "reader" portion of the Bosch sensor is slightly larger than 1/2" - which is the size of drill bit I used to drill into one of the anti-foulers to make room for the O2 sensor. If you're running the original O2 sensors, a 1/2" bit will provide for enough room. If it's a Bosch O2 sensor, you probably need to look at a 5/8" bit or the next larger size.