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Per Norrgren posted a topic in Engine, Transmission and ExhaustHi, New to the forum. (Have tried to find what I am looking for but no luck, apologies if I have missed some old posts) What I have is a Polo 9N Vin WVWZZZ9NZ3Y057956 Var: SC AZQ X01 ; VER: SGFM5 2T037 1N1 L0GE intermittent 16555 - bank 1 running lean, error message. I have a MaziDAS DS808 diagnostic tool and can run the live data on the ECU which is great as I can see in real time the voltages, etc. But, what I do not know is what should a good value be for the different sensors? I have been pointed in the direction of the two lambda sensors (pre and post cat) as well as to the air pressure in manifold (as well as fuel filter, small vaccuum leak, etc. ) The sensors all works and gives different values but I can not say the values are within ok range. Can anyone point me in the direction of where to find the sensor range values please? greatful for any help regards Per Norrgren