engine "fail safe-red" light came on, could only drive 20 mph 2 miles to shop. on 2001 Jaguar XJR

Tests show that throttle linkage assembly sensor is needed. Must entire throttle assembly be re[;aced or just the sensor? Cost? 140,000 miles. Thanks!

Asked by for the 2001 Jaguar XJR
I had to have the entire throttle body on my 2001 xjr replaced. It was about $2,500 at a Jag dealer. Afterwards, the car's performance was never the same (it didn't have that 'rip your face back' acceleration any more). They said it happens with increased pollution regulations that cause changes to the (newer) spec.

Thank goodness it was covered by warranty. You're lucky. Mine failed at about 65,000 miles.

Beautiful car... Maintenance nightmare.