I know you may say "i already tried that " but we had a vw caddy van with the same problem and i never thought about the spare key as i was a normal key with no chip or battery and i allmost removed the injector pump but as i said the wife put the plane key in and it started, i never knew a plane basic key had a chip in it but some do, sorry if you have tried all that but i thought iwould mention it.

The wife is never going to let me forget that