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Old 11-15-2012, 01:41 PM   #14
Scooby Specialist
Member#: 111565
Join Date: Apr 2006
Chapter/Region: W. Canada
Location: Winnipeg
1999 Legacy 2.5GT
2007 Legacy GT Spec-B


A quick and cheap way to avoid the dreaded P0420 is to use 2 spark plug fouler's( to move the rear O2 sensor out of the exhaust stream. Most people seem to have good results with this method(myself included) and only takes a few minutes to do. Just drill out the bottom of 1 fouler so the O2 sensor can fit inside screw them together and then insert back into your exhaust pipe.
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