Boost battery and will be able to remove key
Make an battery jumper with another car , then you can remove the key
SOURCE: My Porsche Cayenne S Key fob no longer unlocks the Door
unlock the door then press the lock button on remote and hold down for 20/30 secs.manual does say hold button.....
SOURCE: Porsche Cayenne 2003 battery removal Problem -
The spline socket that is used is a 16 point. You may have to get it from Porsche depending on the area you live in. If you are in a big city, you may find it at a local parts store. Either way, Get one and keep it in the car. Look in the trunk first in that little kit, it may be in there in the trunk area near the spare tire. just for info, there are posts in the engine bay, on the driver's side where you can just start the vehicle. There may be one in the trunk area as well that is used to start the engine. Make sure you get the proper battery. If not, it can cause electrical issues that will make you think your car is posessed some how. Let me know if you need anything further.
SOURCE: how to remove "service now" on my porsche cayenne
You will need a code reader that connects to the cars OBDII system port. With the reader you can read the codes that are causing the light to come on (fix the problems) and clear the codes. The light will go out. I would caution that if you are seeing the "Service NOW" light that you should stop driving the car immediately and have it looked at. There is another message that says "Drive to service location" which is less severe.
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