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Discussion Starter · #1 ·
Hello, For the past 4 months I have had the ZZP downpipe, midpipe with spun metal cat and rear section of exhaust with Magnaflow muffler. Also
I have the Trifecta Elite tune. Now I havent had any issues until recently and I keep getting the p0420 code. I thought this was something that
wouldnt happen after being tuned. What should I do?
 

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Discussion Starter · #3 ·
I read every post on that thread and none were any help towards my condition. I have 1.4L with modifications. My main concern
is to why I had no problems for 4 months and now the CEL is illuminating.
 
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