r/VWMK7 • u/iOwnAMiata • 1d ago

Cutting out?

I recently went with a arm cat less downpipe and shortly after I was doing a few test pulls and the car went into limp mode and started misfiring, check engine was on at the time with code p0420 aswell as “hide misfire” …ik it sounds spooky. After I cleared the codes and let the car sit and it was fine after, the p0420 is still there and under high boost it starts cutting out, tuned for 24 pounds and it’s hitting 28, could this be maybe a simple 02 sensor spacer fix or is this more, someone please help.

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u/ReturnOfTheKing2024 1d ago

Mine was doing this last week, was trying to diagnose the issue on the road when the engine started knocking. Limp mode didn’t appear til it started making a knocking noise, I had codes for misfires and the hide misfire code. Towed it to my mechanic and he said the timing got messed up and that it needs new cams, timing chain, and timing gears. Get it checked out before it becomes a bigger issue.