i have the same issue with my Injen intake on my 235. I've had it on for about a week and everything was fine. sounds great, it even felt like the car pulled harder. then out of nowhere I got a CEL with a code 00172 for running rich in bank 1. I really don't want to put the stock box back in, but i don't know if i have a choice. The car definitely doesn't seem to pull as hard now.
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