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Yes, there is some flexibility there, that's the whole reason behind this self-adaptaion, it can adapt to different conditions, and it's expected it will creep one way or another, especially later in the engine life (engine wear). Ideal is 1.00, that's right in the center. But if the mixture starts running too rich or too lean, it has to eventually stop adjusting the mixture and call it quits as far as self-adapting anymore; if it keeps leaning out the mixture, well as anyone can say it won't run well without enough fuel, and of course if it does at least keep running, in a too-lean condition the motor will eventually "melt down". Just the opposite, too rich is no good either, especially for the environment and the cats, and eventually you'll flood the engine. As you can probably guess, the MAF sensor being incorrect can lead to this self-adaption being all wrong. The MAF sensor helps determine the self-adaptation, the front O2 sensors determine the actual Lambda cycling of the mixture (rich-lean-rich-lean), the rear O2 sensors aren't really for anything except determining that the cats are doing their job.
Gilly
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