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Why won't my 2002 Ford Fairmont lock?

I have 2002 BA Ford Fairmont and I cannot lock the car if I use the remote. It locks but immediately unlocks and beeps. it also will not lock manually with the key. If this an actuator fault how do I know which door has the problem?

A faulty body computer is the most likely cause of this behaviour. It’s a common enough fault with this series of Ford Falcons and it often requires the body computer to be replaced as well as the ignition keys to be re-coded to the new computer. Unfortunately, it’s not a cheap fix, although you could try a second-hand computer from a wrecking yard. There’s every chance, though, that it could develop the same problem sometime in the future.

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