1995 xj 6 trans mission light on and wont idle

SOURCE: how to change rear struts on 1995 xj6 jaguar

Its not the simple on teh 1995 xj6, the rear axle needs to be dropped down. If you email me I will send you the factory info to replace them [email protected]
JPTCAT

SOURCE: Jaguar 1995 XJ6 idle doesn't hold

I had this problem with my wifes car. I went through the car top to toe and found more than one problem causing this intermittant issue.
I found a weak crank sensor, when warm it was intermittantly losing a signal, replaced it and the problem was a little better, I then found that the throttle position sensor was also intermittantly not within the range it should be, replaced it and it helped, I then was getting the oxygen sensor code and that was only due to the car stalling, nothing to do with the o2's, I finally traced the final issue to the integral harness on the valve body inside the transmission, I replaced that harness and fitted a new transmission speed sensor and the car has been perfect.
I know you have several issues here that could be your problem but you now have a base to start from.
Last thing is the car may just need an engine set-up if you are no longer having any codes. This is only done by the dealer using there WDS computer system. The perform a oxygen sensor orientation test, they set-up the kick down and also set-up the Throttle positon sensor (TPS).
Hope this helps.
JPTCAT

SOURCE: my jaguar XJ6 cuts off after driving on highway

Fix and trade in!!! You will have to visit a local repair shop to have codes pulled from ecm (engine control module) and tcm (transmission control module) to determine what has failed.

SOURCE: Transmission Fault Light

NOT SURE ABOUT A JAG BUT ALL OTHERS I WORK ON JUST DISCONECT THE BATTERY FOR A FULL MINUTE AND THAT RESETS THE COMPUTER

SOURCE: 1995 xj6 jaguar, doesn't liketo start when cold,

check your flowmeter, this electronic device moniters air/fuel mixture, commonly located on the inlet manifold near injectors