2009 Mercedes cls 320

Into our workshop this week was this Merc with parking assist problems and automatic door lock/unlock not working.  A full serial scan showed up 2 faulty parking sensors on the front. A check of these sensors confirmed the fault and 2 new sensors sourced.

 

Next we checked the locking system, the normal way it should work is as long as you have the keys on you when you approach the car when you pull the handle on the door it should unlock for you. We stripped the drivers door down and removed the door handle that contains a microswitch that unlocks the door and found water ingress into the switch.