Hey everyone, I need some help, my 2012 audi a5 2.0t is up for inspection. i had a stage 2 apr tune and a ecs high flow cat. i took the tune off since it shuts off the monitors for the rear 02 and my mechanic added like an inch o2 spacer and still i’m getting the p0420 (efficiency below threshold) code. i was wondering if ANY of you had this same prob and what was your solution. I know that the best option would be to buy a oem cat but i would like to save that for last resort since ya boi struggling out here. thank you!
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