1st Gen R53 Cooper S Flat tire light gremlins

Discussion in '1st Generation: 2002–06 R50, R53 & 2004–08 R52' started by BThayer23, Aug 2, 2009.

  1. BThayer23

    BThayer23 Well-Known Member

    Jun 12, 2009
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    Has anyone run into this before? My MCS has 75k of mostly problem free miles. Within the past few months, the flat tire light has come on several times and refused to reset. It only happens when it's raining, and the tires are never flat nor losing air.

    I wouldn't describe myself as electronically gifted, but I can run a multimeter. Anybody have a clue where to start looking?
     
  2. Tüls

    Tüls New Member

    Apr 3, 2009
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    Prolly ah wheel speed sensor. No big deal.
     
  3. BThayer23

    BThayer23 Well-Known Member

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    Where are those located on the car? Is there a way to isolate the diagnosis to a specific wheel or do I just replace 'em all?
     
  4. Deviant

    Deviant Banned

    Apr 23, 2009
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    I'm not sure where they are exactly (except to say near the hub somewhere) but I would replace them all at once, they're all subject to the same dirt/water/elements and if one failed the others probably aren't too far behind.
     
  5. theCapn

    theCapn New Member

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    Yep, I had one go bad on me at about 20k mi. However, when it did go bad, all my lights came on. ABS, DSC and tire.


    The wheel speed sensor is the wire going to the almost center of the hub/knuckle/spindle.
    Should be an allen socket-cap bolt that holds it in.
    If you have a plug that has separating, it may be causing the intermittent nature.

    Also, to reset the light, you have to hold it for a while. Not just press and release.

    One more thing. Are all of the tires set at the same pressure? They may not be losing air, but they do have to match (within reason).
     
  6. AllBlack05S

    AllBlack05S New Member

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    Might just be a heavy right foot. Only happens when its wet out right? If you drive with DSC off like I do you get that unless you have a limited slip diff. If you spin one of your fronts in corners a decent amount when its wet you get the light. If no wheelspin then it is a bad sensor.
     
  7. Deviant

    Deviant Banned

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    I've been running DSC off for over a year and haven't had any tire light problems, I'd double check your sensors too (or maybe you're spinning way more than I ever let it.).
     
  8. BThayer23

    BThayer23 Well-Known Member

    Jun 12, 2009
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    At $161 a pop on RealOEM, that's an expensive proposition. I might try to rotate a new one around to each corner and see if that fixes it.

    Yeah, I saw that diagnosis on [the other site], but this is just the flat tire light.

    I'll check the sensor plugs. Thanks for the specifics on the location.

    Yeah, this has been happening for the past 3-4 months. I've run two different sets of wheels with different size tires, and I put a brand new set of tires on one of those sets of wheels, and there was a track day in there too, so I'm pretty sure it isn't the wheels that are causing the issue. I had the tire light go on legitimately several months ago when my adjustable lower rear control arm loosened up, but everything's tight now. And yes, I reset the light each time I swapped wheels.

    I have an LSD, and I drive with DSC on unless I'm trying to beat some punk at the light. :lol:

    Other than checking for loose connections, it sounds like there really isn't any way to diagnose a bad sensor other than replacing it with a new one. :confused5: I'll post after I jack the car up and look.
     
  9. putterfarm

    putterfarm New Member

    May 18, 2009
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    I've had the idiot lite thing since coming home from the Dragon this year. I know it's a sensor but which one, don't know, so I turn off the ign. and start it back up and keep going (easy w/man.) just don't do it going around a corner, no power steering while off.
    Until someone figures how to find the bad one I for one can't afford to replace them all. I wish there was an aftermarket one :mad2:

    Mark
     
  10. Deviant

    Deviant Banned

    Apr 23, 2009
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    Step one: find car with warranty
    Step two: swap sensors
    Step three: bring warranty car to dealership
     
  11. putterfarm

    putterfarm New Member

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    I like it, I like it :devil:
     
  12. BThayer23

    BThayer23 Well-Known Member

    Jun 12, 2009
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    WARNING: MINI CARNAGE

    DON'T LOOK IF YOU'RE SQUEAMISH

    A friend's MINI caught a curb at a bad angle.

    My question is this: is that blue clip the wheel sensor?

    [​IMG]
     
  13. putterfarm

    putterfarm New Member

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    I guess nobody knows, I know I don't :confused5:.
    Mark

    p.s. used to live in Sanford :eek6:
     

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