Hello All,

Back with the XJR (@115k miles) today and have a collection of error codes:

P0783 - Gear selection 3-4 shift malfunction (Pending) - Im hoping this is due to needing an oil change, if anyone has any knowledge on this please let me know!
P1647 (x2) - Control unit 11 - im assuming these are lambda issues? (1x pending 1x confirmed)
P0353/4 - Ignition coil C/D primary/secondary - circuit malfunction - Im assuming these are meaning I need new coil packs? (Pending)

Any help or advice appreciated...

 

Begin your diagnosis with reading the battery voltage with a voltmeter across the terminals.

With the ignition in the OFF position, there should be a minimum of 12.6 volts present. If not, charge the battery for five hours at 2 to 5 amps and retest. If there is still less than 12.6 volts, the battery is failing or weak and must be replaced prior to performing any further diagnosis. A failing or weak battery can cause random DTCs and instrument cluster warnings.

 

Didnt think of that! could explain the central locking intermittent issue too.. I will plug the CTEK on now pre-emptively, cant do any harm

 

fix your misfires they cause horrible shifting

if p0783 still comes back after your transmission is most likely done

 

And that would mean new auto box time?

 

if fluid isn’t low then yes

p0783 is the kiss of death

 

Just got under the car and looks like a leak from the box, hoping its just a seal and the fault is due to low oil..

 

So, an update on this. I bought the car for £4200 with 115k miles, I think thats a pretty good deal if I can sort the issues cheap enough, im lucky enough to work in the industry so ive just picked up a new transmission filter for free, I will be testing the battery and fuses tomorrow.

Issues: Passenger door not opening inside or out, passenger window wont close on driver control module (will on pass one), Gearbox fault (looks to have a leak so hoping thats all I find...) 2x lambda warnings, 2x ignition coil warnings, Snapped o/s parking brake cable

Ive got until November the 12th to have this ready for a road rally event over 800 miles...

Parts ordered so far, transmission filter, service kit, caldoofy intake, K&N filter.

Waiting on further diagnostic before ordering the ignition coils and lambda sensors.

Struggling to source parking cable...

 

Forgot to add, when i use the wash wipe system it cuts the engine out.. possible front electronic module?

 

Another thought, subframe shows corrosion, could be a ground issue?