Hi all, got a bf and I upgraded the exhaust, including a high flow cat. Engine light came on which I expected but was no big deal as I got a custom tune soon after. Anywho, was all sweet after the tune until a few days later when the light came back on, threw it on a diagnostic machine and the code said it was the oxygen sensors. Called my tuner and he double checked the tune file and made sure he turned the secondary sensor off. So... was wondering if anyone else has had this problem? Gonna take it back to the tuner obviously but was just wondering if there is a quick fix to this? Back when the car was stock I used to get the light come up occasionally so im thinking it could be the front oxygen sensor. Anyway as youd expect with the engine light on it runs like a tractor so any help would be appreciated! Cheers guys