OK. I've read a bit about this and as far as I can gather as the air filter gets dirty the air fuel mixture is altered via the maf to optimise fueling . If a reset isn't completed the car continues to fuel as it did with dirty filters. Some believe over time and calculations by the maf and ecu the car will relearn itself , weather it does or not I cant say .I've never ever noticed any difference whatsoever after changing air filters and not doing this adaptation. Good or bad .
Had about 5 cars now where it as been restricted do to air filter blocked no fault on dash shows up on xentry and das just down on power once changed and reset on adaptions big notice on driving. Always reset when carrying out service
I think it makes a difference if old filter have bee driven to 'fully blocked'. Official 2 years is true, but for some reason these engines suck inside everything smaller than squirrel on the road. That's why I do change always with oil change.
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