Another central locking problem

[Modded996]

Recently my key fobs stopped opening my 996 without manually using the blade. I am tempted to say that I just need two new transpondor heads for the two fobs I have even though if I hold the door in the unlocked position and hold down the unlock button it will roll down both windows (so it is getting some sort of signal). However, the central locking is operating a bit weird to me. When I turn the car off, it has a tendancy to automatically unlock and relock the doors immediately. If I press the unlock button it will stay unlocked. If I lock the car with the key blade it will stay locked. No horn beeps or unusual behavior while driving--those symtoms previously led me to change the door latch mechanisms on both sides. But, sometimes I don't get 10 seconds to turn the car on before the alarm goes off--when this happens it happens immediately. The biggest problem, I've saved for last: the fuel door is not unlocked under any combination of events; I have to use the manual release.

So, I've searched around and I'm primarily running into key fob head replacement recommendations and door microswitch articles (again those have already been replaced). I'm not sure either of these is what is going on. It almost seems like the alarm is getting a bad signal from some other component and its in a bad state. Advice?

Thanks

[Loren]

Makes sense to check it with Durametric, a PST2, or PIWIS tester for alarm fault codes - before you spend money.

You might also check under the the left seat and see if the alarm box got wet.

[srburkes]

Recently my key fobs stopped opening my 996 without manually using the blade. I am tempted to say that I just need two new transpondor heads for the two fobs I have even though if I hold the door in the unlocked position and hold down the unlock button it will roll down both windows (so it is getting some sort of signal). However, the central locking is operating a bit weird to me. When I turn the car off, it has a tendancy to automatically unlock and relock the doors immediately. If I press the unlock button it will stay unlocked. If I lock the car with the key blade it will stay locked. No horn beeps or unusual behavior while driving--those symtoms previously led me to change the door latch mechanisms on both sides. But, sometimes I don't get 10 seconds to turn the car on before the alarm goes off--when this happens it happens immediately. The biggest problem, I've saved for last: the fuel door is not unlocked under any combination of events; I have to use the manual release.

So, I've searched around and I'm primarily running into key fob head replacement recommendations and door microswitch articles (again those have already been replaced). I'm not sure either of these is what is going on. It almost seems like the alarm is getting a bad signal from some other component and its in a bad state. Advice?

Thanks