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My key won't open the passenger door. The key works on everything else.

OK. So the passenger's door lock obviously needs attention. Perhaps it has been replaced at some stage with a lock from another car with a different key code.
Someone such as Armstrong Locksmiths should be able to resolve this for you.

Thank you for your response. The lock suddenly decided to work. I had previously put some oil in, so perhaps that did the trick eventually. However, if it happens again I will take your advice.