Thread: recall
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Old 08-13-2020, 04:38 AM   #5
subaru_gc8
Scooby Specialist
 
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

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the po420 is a catalytic efficiency code. so it really would have much to do with the upstream o2 sensor, it would me more your cats or the downstream o2 if anything
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