If your car is not standard 2.5% IIRC then you need to check with the chip/author what CO should be as this effects the whole map. The screw is on ECU as said unless CAT, if you do adjust do in very small increments as is sensitive, it is known as the global mod as it subtracts fuel as a percentage which is why your supposted to check AFR/Det to make sure you are not lean up top.
Make sure car is at running temp before you check, good idea to let fans cycle then off, then check.
Martin
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