Check battery on key fob. Also you can usually take the key fob to a parts store and have it checked to see if it is transmitting a signal. Hope this helps.
SOURCE: porsche key fob
If the key had gone faulty, the key code must be re programmed on the vehicle computer. This can be done only using a PIWIS tool, available at the dealer or at a qualified Porche garage.
Try also the following reset:
turn ignition on,
turn off.
remove
the transponder from the column
push any button on the fob within 6
seconds.
This procedure will reset the key synchronizing again with the vehicle computer.
SOURCE: i have a grand voyager
dont go through all the hassles of removing the door trim just take the terminal off the battery for about a minute then reconect again worked on mine good luck
SOURCE: key fob remote start issues
You need to get one that works on the same wide range frequency as the reciever in the car, and then it's a simple matter of opening both the new and old fobs, and matching the fine frequency settings by putting the little switches inside where they should be according to the old fob's switches. If there are no switches in the old fob, it's preset and there's not much you can do about it.
SOURCE: 2007 Saturn Aura; when trying remote start horn
press the lock button on the remote then press the remote start button. if this does not work check remote start status using steering wheel buttons
SOURCE: have mercedes E class key fob will not open doors,
If key will not turn
Car battery flat,charge or jump to activate elec ignition
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plus i think i put too much oil in before this problem occured as it was blowing smoke everywhere for a while
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