1999 Jaguar XJR Questions

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I filled up the gas tank yesterday with premium level fuel. Don't know if this is a factor in the problem or not.
I have a 99 jaguar xjr. Automatic 4.0 liter supercharged. When accelerating from stop, the gears don't shift properly in 2nd and 3rd gear. There is a slight jerking motion when it shifts into those gears. Does this mean my transmission is giving out? Will a transmission oil and filter change fix this problem?
The pair of wires appear to come from under the back seat into the boot, the red wire is attached to the positive terminal on the battery, however the black wire is not connected, it has a male connector on the end, just laid along the front of the battery and just beyond.
Anybody assist it this matter, where does it join, or doesn't it?
I put the car into Park after driving and when you go back to start the car the car will start but the car will not move out of Park and go into reverse. You either have to wait for the car to "reset itself" to move into reverse, tow the car to home and wait, or we have seen where we "jerk" the car back and forth with two people in the front seat and the car goes back into gear and then goes into Reverse. No issues with starting the car and no other issues with the car. I had the tranmission rehauled last year (due to the car hit a pot hole and it damages the transmission) and also went back for them to re-look at this as a possible problem. When this happens the light on the dash says "Gear Box Fault". This message does not always show when this happens. I really need to know how to fix this. Please help me if you have any ideas. 1999 Jaguar XJR with 78,000 miles.
I just bought a 1999 Jag XJR today and the warning lights on the dash keep going on and off. Check engine, Coolant low, etc. Everything has been repaired on the car. All fluids are full. A newish tranny was just installed. How do I get the idiot lights to stop blaring at me? Also, how do I program the garage door openener if I don't have a seperate remote for the door? Any help would be greatly appreciated! Oh, one more thing. The key fob doesn't operate the door locks or trunk. Do I have to go to the dealer to have that reprogrammed?
my radiator fans seems to run alot , even for a min or so after I shut off the car. the running temp gauge is fine.the car runs great. could it be a stuck thermostat?
Could anyone please tell me what the code P1601 means??? The check engine light came on and this is the code I got back when did the diagnostic. I would greatly appreciate any input.


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