2003 xtype jaguar suddenly turned off i check fuel pressure none so it says engine fault gear box help help please

You should go to www.reliable-store.com they have got books on every vehicle and also how to service/repair it,

service/repair/owner's/maintenance manual with
parts info, fuse box, gear box, torque specs,coiling, wiring diagrams, electrical diagrams, fuse diagrams, error codes, etc everything

Any fault codes is the check engine light on? Is the fuel pressure ok under load?

gear box sensor ? which one and whats the problem?

my jaguar 2.5 xtype wont reverse

This may be a silly question but have you checked your fuel filter?
If not it may be worth a check or a change in any case (they only cost about a tenner) I'm pritty certain it is the same filter for all XType petrol Jaguar part number C2S20906 but have your local components supplier check against your VIN.
The filter is located under the car at the rear RH side door about 8-10 inches in forward of the fuel tank.

You will see a large black or silver unit with a greeny/blue buttons.
The connectors are push fit just squeeze the two blue buttons together and pull the fuel line off, on the other squeeze the grey buttons and pull the fuel line off. When replacing ensure that you note the direction of flow on the filter and fit accordingly. Once refitted switch the ignition to position 2 but do not start the engine. Wait 10 secs then turn off. Repeat this once or twice.

I could be many things causing this fault, without a trouble code to go off its hard to say. Autozone and O'Reillys autoparts usually scan your car for free. Get the codes and repost on here for a more accurate assessment of your faults. Hope this helps

get your car scanned and reset the light

it sounds like the rear engine oil seal is leaking check the breather on the engine to see if its blocked that could cause oil leaks from a build up of pressure

replace your crank positioning sensor