I did some mods to my camaro zl1 1LE and now my check engine light is on… I took it to a shop to get a new intake , e85, cooler spark plugs, flex fuel kit , and got a corsa extreme exhaust installed and a tune. The owner said it’s normal for it to come on but i took it to another shop and they ran a test and said it was tune right as the tune would of cleared the light , it came up w co2 sensors problems. I’m a little confused on how to fix it as some ppl say it affects the performance but others say is normal. do i need a better tune or what should i do