Rather odd spare key

[patc]

I appear to have a spare key that unlocks and starts the car but only for a matter of seconds then it turns off. What's that about.

Thanks

PatC

[trog_nfs]

A missing / fecked immobiliser chip

[Wayne]

A missing / fecked immobiliser chip

Yep

[patc]

There's not one there to be fecked    it's just a normal key with black plastic surround.  Straightforward to get one sorted?  Always useful to have a spare.

[Wayne]

There's not one there to be fecked    it's just a normal key with black plastic surround.  Straightforward to get one sorted?  Always useful to have a spare.

1996 onwards mk3 had a built in immob set up with a chip in the key, so you key that starts it for a few secs has not got a chip or it has lost its code.

[patc]

How does it find it again? 

[patc]

Any ideas?

[Wayne]

Any ideas?

Needs coding with vag com

[Deano2711]

You can test it by holding your original key near the barrel and using the spare key to start the car. 

[Bellend]

Valet key?