astra 1.7cdti 2004 54 newer shape - throttle peddle - l33mar

throttle peddle went last wekpek, diagnostic checker said to replace peddle, done this, it drove a few times and exact same fault has occured, cant drive it to a garage as no accekaration, could this be asensor? any one had this before?

feel free to email me lmartin0781@tiscali.co.uk