Cleaning
I have an aftermarket VDO central locking system. Although it is supposed to be sealed I sometimes have to open the FOB and clean it out. Appearently it gets quite dirty in your pocket.
My 98 940 also has an immobilizer, but this system has some passive electronic device in the key itself. No need to push any button, it is activated by induction (I guess) from an antenna ring around the ignition key barrel.
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