Just aquired a 2000 s type jag and the mileage odometer is not working has any body got any answers please

Depends on the year of the vehicle. Newer vehicles store mileage in the body control module. The odometer is jsut a readout

Good to know that once in a great while we actually help? LOL

This is right from GMC service repair manual
Odometer
The vehicle odometer is calculated and stored electronically in the instrument panel cluster (IPC). The base IPC contains a season odometer and a trip odometer. The uplevel IPC contains a season odometer and two trip odometers. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer.
The IPC calculates the mileage based on the vehicle speed signal circuit from the engine control module (ECM). The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested by the activation of the Personalization button on the steering wheel controls.

unfortunately it is not the fuse it is the odometer broken internal to the cluster you will need an entirely new instrument panel assemble to remedy the problem, if you purchase one from the wrecking yard and have installed you will be forced to stick with whatever mileage comes on it, if you have a new one installed from the dealer they can program it to match the stored mileage in your origional cluster

Follow your air intake hose to where it's attached to engine, that's your throttle body.

Two common problems that cause this are 1st,sticking throttle bode,or 2nd,Egr valve sticking.

Jaguar recommends the highest grade of gas for the best overall performance. usually this is between 91 and 95 octane, however many of our Jaguar customers just put the mid- or low grade fuel in the car. Now you can do this but the performance and in most cases the gas mileage wont be as good as the premium gas.
The way I see it is if jaguar did all that testing and engineering for that car and they came to the conclusion that it works best with high octane then i would do it. But hey, its your choice, i hope i helped you out.

The speedometer has to programmed to the Car, A jag dealer can program it for you

Hi, the problem is, your throttle body is restricting the air flow to the engine due to carbon buildup, simply remove the complete throttle body and clean it very good and reinstall, your problem will be solved for sure.

The problem is your Body Control Module,located on top the glove box.It will need replaced & programmed to fix.Costs about $300.00 It also has to be new due to mileage being stored inside.Hope this helps