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Old 06-11-2014, 12:03 PM   #1
Natoli
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I was driving home last night and my cel, traction control and cruise control came on, I've read that's what happens when the cel comes on but I scanned my car and it's throwing me a P0420 and I'm thinking that's because my car is slightly modded and no tune I'm going to take it to the dealer today and see what they come up with. My 2011 wrx has a Cobb intake Cobb short shifter greddy exhaust and gfb blow off. Any suggestions ?

I'm a summing it's because the high flow cat but going to get checked out anyway
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Old 06-11-2014, 12:28 PM   #2
STi_Pilot
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You're right. You need to get tuned when running most intakes and downpipes with high flow or no cat. At the very least running the OTS stage two map from Cobb AP will prevent you from throwing codes due to performance intakes and downpipes.
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Old 06-11-2014, 05:06 PM   #3
KillerAngel
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P0420 is a low cat efficiency code, so the high flow cat could be the culprit. How long has it been in the car?
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Old 06-27-2014, 08:31 PM   #4
Natoli
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Sorry it took so long to replay, Cobb stage 2 cleared everything up thanks everyone
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