1993 was first year of Zetec - I suspect it's a typo Ruut. No immobiliser on my '93. Dave's advice re: aerial close to the ignition key socket is good though. Don't know whether it is a passive or active key, if active, has the battery been replaced?
No battery in the Key, was told sometimes the key can go out of sink, try the spare key
Very much in the dog house, could be up for rehoming