Airbag light and Unlock lock issue - Think they're related

[maor]

I have these error codes. I am very confident they are related now as I was having intermittent lock issues.

I can't lock my door sometimes when I close the drivers door, when I open it suddenly my car can be locked and unlocked. Tried the keyfob tricks etc, none worked.

Then recently my airbag light has come on. I cleared it but it came back on straightaway.

[Loren]

The door lock one is likely a mechanical problem with the door lock that prevents it from reaching it full lock position at times.

I would clear it and see if it come back.

Airbag -- Fault codes 12, 13, 28, 29, 40

Ignition circuit, driver's side airbag

Possible cause of fault

- Short circuit to B+/ground or open circuit in the wiring between the driver's side airbag unit and the airbag triggering unit

- Driver's side airbag faulty

[maor]

I will take the door apart.

What actually could fail on the airbag? Could put in a used part...

Will check out the wiring etc.

[Loren]

You need a special tool (box) (and a PST2 or PIWIS tester) to test the airbag trigger circuit (airbag out).

Testing the airbag itself also requires a special tool and lots of caution. A job perhaps best left to a competent Porsche shop.

[maor]

Nothing wrong with checking if there's anything obvious wrong behind the door trim I guess. Can't hurt tbh.

[maor]

Fixed this.

There was an aftermarket fusetap on the alarm fuse. Moved it away and cleared the airbag light. It's all good now :)