Thread: P0420 Code with a catless dp
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      11-22-2014, 12:45 AM   #2
r33_RGSport
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Originally Posted by BluF22 View Post
Anyone get a P0420 Fault code with a catless downpipe?

I do have a Stage2 JB4 and thought it auto clears that.
Is this the first time it shows up since you install the JB4?
How did you get that code, from the JB4 via USB and JB4 desktop software or OBDII diagnostic tool?
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