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Discussion Starter · #1 ·
Just started getting a CEL on my 08 FA5. Got a PocketScan and it read P0420.

Catalyst Efficiency Below Threshold Bank 1.

I'm running a X-Intake, custom 3" magnaflow HFC to stock HFP exhaust.

Could the HFC causing the O2 sensor to trip? or is it just a bad cat?

Car has only 16K on it. Cat is unknown since I bought it off someone on the 8th.

Any ideas?

TIA
 

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Discussion Starter · #3 ·
gonna try a defouler to see if it helps. just ordered it off of corsport.
 
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