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Thread: E39 525i MAF

  1. #1
    BMWHaus Contributor
    Join Date
    Mar 2014
    Posts
    621

    E39 525i MAF

    Quick MAF question lads, whenever mine is plugged in on my 525i the engine light will eventually pop on with lambda sensor issues, is this a faulty MAF sending false air signals and is due a replacement? My transmission also doesn't shift right and I have a slight rough idle when cold which I've read can all also be symptoms?
    E39 525iA Sport - Sapphire Black - SOLD
    E39 528iT SE - Orient Blue - SOLD
    E39 540i/A Sport - Topaz Blue

  2. #2
    BMWHaus Guru
    Join Date
    Jul 2013
    Posts
    1,706
    Check for air leaks, esp the intake boots from the maf to the throttle.


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  3. #3
    BMWHaus Contributor
    Join Date
    Mar 2014
    Posts
    621
    I have previously replaced the upper intake boot and the lower looked OK, will take it out again and see if it has since degraded.
    E39 525iA Sport - Sapphire Black - SOLD
    E39 528iT SE - Orient Blue - SOLD
    E39 540i/A Sport - Topaz Blue

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