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Central Locking/Alarm Fault

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My 99 MY C2 Cab has developed a very irrittating fault in that I can't lock it!! Whilst this has pleased her indoors in that it significantly increases the chaces of ot being stolen - it is slightly troubling.

The symptoms are:

When you try and lock the car with the key fob, the central locking activtaes, makes a follow on noise and then unlocks itself with the horn sounding twice. The same happens when you unlock the car. If you use the key in the door, its pretty much the same and it just won't lock and stay locked.

If you are inside the car, the swicth on the dash does lock the car and unlock as normal.

As far as I can see all the lcoks are operating and nothing is open like a centre console or boot etc.

I am taking the car to the OPC for a read out but am afraid that they will start with the usual nonsense of lists of parts to be replaced with no real idea of what is actually wrong.

Does anyone have ideas? The clunking sound sounds like it is coming from in front of the windscreen - is this the location of the cntral locking unit?

As always. Thanks

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I had EXACTLY that problem. It turned out to be a faulty switch in the drivers door handle assembly. You can lock it by using the emergency locking procedure - described in the manual.

The fault should show up on a PST2 test. If you are anywhere near me in Maidenhead, PM me as I can help you with that. (Just noticed the Solihull bit - Doh!!)

Edited by Richard Hamilton
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Well. The OPC have had a look. They reckon that they can't tell which door lock is faulty - and so it's a question of replace the left one and if that doesn't do it - replace the right one. Do they think I look dumb?

They have quoted 1.6 hours labour plus parts and a total of £270 per side.

I don't understand why the PST didn't pick up which side the fault was on.

I am now not convinced that they know what is wrong.

The central locking switch inside the car works fine and both doors lock and unlock perfectly.

This is mysterious. If I lock the car with the key fob and then press the key again quickly, I get one short horn sound. If I lock and unlock with the key normally I get two horns.


I had the same problem with a customer's '99 996 C2 last week. Turned out to be a faulty door lock (which Porsche diagnosed). Took 1/2 hour to change door lock.

That's sounds right - they quoted 1.6 hours - actual time 30 minutes!!

Last year they quoted 1.6 hours per wheel for brake pads - whilst the car was in for service so already on the ramp with wheels off.

I did all four in my garage at home with jacking each wheel up separately in 2hrs 30 minutes.

I need a job with Porsche - I'd make a fortune on the mechanic bonus scheme or have very quiet days!!

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  • 1 month later...
What is the emergency locking procedure?
Please see the emergency locking procedure in your Owners Manual (under Locking).

Found it. Key in the door, turning to the locked position 3 times...

The factory head unit was replaced with an aftermarket radio/gps system. Do you think that could be causing the problem, or is it a door lock issue? The problem I am having is a single honk which indicates that something is not "closed" at random times. Then, after I receive the short honk the alarm system will activate at random times.


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