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Sigma M system key problem?

I have a Sigma M system on a VW Golf. The remote key seems to have stopped functioning. Couldn't unlock car so used the lock key; alarm went off, & the remote key doesn't stop the alarm either. I've changed the batteries, and the light on the remote illuminates when the button is pressed (so electrics working), but it doesn't seem to be transmitting to the car. What's the solution?
Barry, Hindhead, May 2008
Problem solved now. Just needed a folded piece of paper behind the contact spring.

Barry, Hindhead, May 2008
link Click here to see other fixes for Sigma M system.