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540i Year 2000 Low MPG

Discussion in 'E39 (1997-2003)' started by andyuk66, Jul 2, 2009.

    andyuk66 guest

    Post Count: 2
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    I Just replacd the mass air sensor as the car would not ide.
    Senses I did that my gas mileage went from 18 to 19 city to 15 and 21 high way to 16.
    Could it be the O2 sensors, is there a way to test them?
    Or should I be looking at some thing else.

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