my 2002 wrx automatic will not accelerate

2002 SUBARU WRX
165,000 MILES
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TREVORGLADFELTER
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will not accelerate seems like it is hesitating as if its not getting fuel i had half a tank i did get codes po420 and po 171 but my cel is always on. it was so bad i had to leave it sit
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Apr 15, 2012 at 9:25 PM
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ASEMASTER6371
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check the fuel pressure . if it is ok, you may have a clogged cat converter

Roy
Apr 15, 2012 at 9:28 PM
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CHOPPER
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Check mass air flow for dust on sensor wires. Especially if you are running a KnN filter or similar oiled filter... Subaru fuel pumps rarely go bad
May 1, 2012 at 4:57 AM
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CHOPPER
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Just spray it off with carb cleaner and plug it in.
May 1, 2012 at 4:58 AM
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CHOPPER
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Note also check for torn air boot or disconnected air tubes after mass air flow...
May 1, 2012 at 5:01 AM