Caddy SDi - NO Throttle - Vag com 0777

[adehardman]

Hi

Anyone help with some advice.

Got a problem with my van - 99 MY

It starts fine
But there is no throttle!!!

but Vag Com on and its come up with -

0777 - Accelerator position sensor - Implausible signal

Is that my problem?

Any ideas what and where it is?

Regards

Ade