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International Automotive Technicians Network
Re: Post cat fuel trim lean
Posted to Technical Discussion Forum on 2/11/2020

Thats kind of a misnomer. 25% total (or individual short in some cases) will on paper ALWAYS code and it should. However, a variation in individual fuel cells that is too far out of range can code at any number in the teens on most cars, and on some cars (Merc... Login to read more.