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Thread: PLX M300 issue

  1. #1
    Join Date
    Feb 2002
    Location
    Orlando, FL
    Posts
    8,884
    My Cars
    Turbo 97 E36 M3, 99 M3

    PLX M300 issue

    I've had the PLX M300 setup for 15 years without ever a hickup. I love the simplicity of this unit too. It has the gauge, the sensor control module, and the lambda sensor.

    The problem I'm having is my gauge essentially no longer seems to work. I get a very faint "r" followed by "c" and then "h". These three letter just go in a loop. The lettering is actually very faint.

    The car still runs like a dream, but I wanted to get thoughts on whether it was the sensor, control unit, or the gauge itself. I figure if it was the sensor, I would get a reading anyways. So, its the gauge or control unit at this point I'm thinking. Since this unit has long been discontinued, thinking of going with a new unit.

    Thoughts?

    Can't seem to delete this. Not sure why I posted before at least looking at it.

    It was a weak power connection at the control unit. Not sure if it shifted or what, but works fine now.

    I will say in the process, my black tweeter ring decided to fail. This Florida heat is killing this car by death by 1000 cuts!
    Last edited by BMWManiac; 07-14-2020 at 02:05 PM.
    1997 Arctic Silver/Black M3
    CES Stage IV (651rwhp/615rwtq @ 24 psi)

    1999 Techno Violet/Dove M3
    Auto/Convertible and staying stock!

  2. #2
    Join Date
    Jun 2004
    Location
    The D, MI
    Posts
    1,406
    My Cars
    97 M3, 98 328i, 13 Cruze
    I went to put the sun visor back into position and the little clip shattered all over the interior. Went to check the passenger side and it shattered too.

    I feel your pain on the 20+ year old car.

  3. #3
    Join Date
    Feb 2002
    Location
    Orlando, FL
    Posts
    8,884
    My Cars
    Turbo 97 E36 M3, 99 M3
    Quote Originally Posted by Kevin325i View Post
    I went to put the sun visor back into position and the little clip shattered all over the interior. Went to check the passenger side and it shattered too.

    I feel your pain on the 20+ year old car.
    I 'never' wanted to take the door panel off for fear of breaking the trim pieces loose :-(. Now, I have to do it just to replace that ring! I don't even recall touching it, and I really make it a point not too, and yet, I just found it sitting in the car when I opened the door.....
    1997 Arctic Silver/Black M3
    CES Stage IV (651rwhp/615rwtq @ 24 psi)

    1999 Techno Violet/Dove M3
    Auto/Convertible and staying stock!

  4. #4
    Join Date
    Jun 2004
    Location
    The D, MI
    Posts
    1,406
    My Cars
    97 M3, 98 328i, 13 Cruze
    Oh man one of mine is half broken but the metal clip on the back side is still somehow holding onto the tiny part of the lip that's left.

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