Hi new to this forum, had my car around 5 months. Audi S4 CAKA engine and getting it mapped soon, I was looking at some measured values to get a general idea of the health of engine before a remap. I noticed my fuel trims seem strange. I have negative long term fuel trim over -20% on both banks. but its not setting a fault code for this? Car appears to be running fine. Every car I've ever worked on fuel trims are between - 10% and +10% anything over 20% should be setting fault codes shouldn't it?. Would it possible for someone with a similar S4 to check yours and report back if it's normal or not. Thanks George.
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