W202: seized locks

Discussion in 'Electronics' started by Nasco12, Jul 19, 2017.

  1. Nasco12

    Nasco12 Hardcore MB Enthusiast

    Jul 18, 2009
    W202 C240 1999 Green; Previous: W202 C200
    Post-facelift W202

    Door lock: key goes all the way in but does not turn

    Boot lock: key goes all the way in but does not turn

    Glove box: key works

    Boot lock problems are common on this model. There is a release on the fob and inside the car so the lock doesn't get used and seizes. But in my experience when that happens the key doesn't go in all the way.

    My assumption is that both locks are seized but is there an alternative explanation?
  2. shadenfroh

    shadenfroh Active Member

    Oct 19, 2015
    CLK 320 '00
    Seems like classic 202/208 seized lock. Don't spray WD40, as it's not a lubricant, regardless of what most people tell you. Try some penetrating oil. If you don't have on hand, you can stop by any shop and ask them politely for a quick squirt.
    1 person likes this.
  3. Dec

    Dec Hardcore MB Enthusiast

    Jul 28, 2004
    It’s likely the door and boot lock cylinders are seized; try turning the key to the right as in Pic 9 & 10 below. When the boot lid is eventually opened, flood the key hole with oil while the boot lid is in the fully open position to allow oil to seep down into all of the lock cylinder.


    If the drivers door lock won’t free up then you may need to remove it so as to flood it properly with WD40 or a penetrating oil, remember you aren’t trying to lubricate it, you are trying to free it up with whatever ingredients are in the oil.


    1 person likes this.

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