Porsche 911 just bought, 10 yrs old. Replaced batttery in key remote and now no longer turns alarm on or off and wont open or lock doors. Remote indicator lights up when pressed. PS when using key instead alarm always activates on opening door! Worked perfectly well before!

james, November 2009

The key will have to be re-synchronised to the car.
Try the instructions here -

http://www.911uk.com/viewtopic.php?t=48669&sid=596ca1ceb62256bd2d5e19a667c9137a

If they dont work, sign up and ask.

porker, November 2009