Audi A4 B8 – Door lock replacement 8J1837015A

I press the button and all but my door unlock? Hmm … the automatic lock function of the door stops working …

Hi, I am Bogdan and I invite you to take a look at the replacement of the drivers door lock on my Audi A4 B8.

What where the symptoms?

  • when unlocking with the remote all doors would unlock except the driver’s door
  • needed to lock the car and unlock one more time
  • later was needed to use the mechanical key to unlock driver’s door
  • auto locking function over 10~20 km stopped working
  • RED LED on door lock switch was not lighting up when I was locking the doors
  • DTC in central electric regarding driver door malfunction

What was the part number?

  • My car: late 2009 Audi A4 B8 LHD (Left Hand Drive)
  • Part number from original part: 8J1837015A
  • AKA: 8J1.837.015A 8J1.837.015.A

What would I recommend before doing the driver door lock replacement on the Audi A4 B8?

  • Plastics get brittle when cold, wait for 15+ deg C
  • Source the start bit for the lock. You will need a special star socket for the 2 outer door lock bolts
  • The Lock cylinder/barrel will need to be removed , but the door handle does not need to be removed.
  • Compare parts new vs old, to make sure you have the correct part
  • Adjustment of the door striker might be required
  • Make sure you don’t get locked out of the car.

Now take a look at our video for more insight.