Hey guys quick question.
First of all i have a 1999.5 Audi a4 I am buying a cat delete and exhaust for it within the next week. I have been having a check engine light issue that comes on about once a week, and its the same code every time. It say catalyst below threshold. I was told this was because my o2 sensor was bad but come to find out i had it looked at and they said it was fine... So my question is when i put that cat delete and exhaust on will i have a check engine light on all the time? or will it just keep coming on if i cannot figure out the problem with the code that keeps coming up? And yes the cat delete has both ports for the o2 sensors.

INPUT PLEASE and thank you