Thread: P0420 ?
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Old 05-01-2013, 01:15 PM   #4
art@grimmspeed
NASIOC Vendor
 
Member#: 301037
Join Date: Nov 2011
Chapter/Region: MWSOC
Location: Minneapolis, MN
Vehicle:
2004 Forester XT
Aspen White

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Whats done to the car? Any aftermarket parts or is it all stock? This is a common code for stage 2 cars without a proper tune. This is also in the 2.0L thread and your profile says you have a 2007 WRX. Is this problem on your 2007 or a different car?
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