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P1797 = Neutral Switch Circuit Malfunction.
I am assuming yours is an automatic. On Automatics there is a switch on the transmission that can override the ignition to prevent the vehicle starting if it is in gear. This code is showing a fault in either the wiring to the switch or the switch itself.
This is one of those jobs which depends on where the switch is fitted. On some Jags it is fitted (hidden) underneath the battery box so it's not too bad to get to. However, some are mounted on the transmission housing in a typically silly location and it becomes a much bigger job. Personally I would suffer the pain of paying and getting a good mechanic to do it as they will have all the tools to deal with it quickly.
The jaguar gears get stuck normally if you're parked on an incline. Its a default Jaguar will not acknowledge. rock the car back and forth a couple times and it will shift. Hope this helps good luck!
I had the same problem. Restricted performance and running rough at 3000 RPM. I have an OBDII code reader and found that the problem was in the air mass flow sensor, which is just after the air filter. I pulled this out and found it was dirty and had butterfly wings in it. The last shop where I had the oil changed replaced the filter for me but put in the wrong size. Close but no cigar. Bought some *** Flow Sensor cleaner at auto store and fixed the problem. Get an OBDII reader with the ability to erase the codes. Comes in real handy.
First thing to do is clear the computers memory, which normally does the trick.
Disconnect both battery terminals, switch on the ignition to start 6 times, this wipes the computer memory, and then reconnect the battery, the Positive + first......... then the Negative -----
Start the car and go from there.
Suspect you had a low battery previously, and this tripped the warning.
Get the battery checked, if it is the original, as it is now 8yrs old, and should be replaced.
Yes you do need to remove the bumper, remove the 2 torxs screws in each wheelarch, 1 upper bolt and 1 lower bolts behind the wheelarch liner each side. two nuts inside car each side along upper edge, 4 nuts behind trim on rear edge, and 3 plastic plugs along lower edge. Hope this helps
If the system won't test 1st look a blown fuse, if the fuses are ok you may be the rare case of a burned out Powertrain Control Module (PCM), but before you replace that very expensive module make sure the system not self testing is verified with another tester/code reader/scanner, I would buy one, they are easy to use the test plug is under the steering column dash panel, This is called the OBD data link connector.
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