Engine failure mode message on display

if it is a rattle in the engine when under load or acceleration , it is detonation and is the result of lean mixture and incorrect timimg
run the fault codes
check fuel pressures and injectors

the 3 main issues with jag electronic park brake faults are 1st the sliders in the rear caliper frames sieze up which tells the park brake module that the travel is excessive and turns it off 2nd the wiring to the park brake motor chaffes on the rear subrame. 3rd the park brake motor fails. try a battery reset by disconnect the -v battery terminal for a couple of mins. reconnect and work parkbrake on/off to recalibrate, if it still comes on parkbrake failure then try the other poss faults, hope this helps

you need to probably bring it to a garage and get those codes reset or figured out

SOUND LIKE FAULT IN A WHEEL SPEED SENSOR OR ABS BRAKE UNIT.. BUT HAVE JAGUAR DEALERSHIP CODE SCAN ABS HYDRALIC MODULATOR BRAKE UNIT. SEE WHAT FAULT CODES SHOW UP.

First try to find a Good Independent Jaguar specialist, as these tend to give much better service on difficult problems than the main dealers who always seem to just want to put new parts on your car and give you a massive Bill ! Fail safe mode can be caused by many things. faulty temp sensor - throttle position sensor - air flow sensors- faulty coils - the list is endless ! Get the codes read on your car by a specialist - this history will show areas where the fault lies. If the codes are not too clear a running monitor test on your car when in use can help to identify the problem area. But make sure you take it to a GOOD garage ! Don't panic as the fact that the car is still drivable and the fault resets when restarted shows that the problem is in one of the electronic sensors - components or could even be a corroded wire in a cable loom. There is a list of known problem areas and reoccurring faults that will be known or accessible to a Jag specialist or Good Garage. Hope this helps - good luck.

have this fixed immediately!! Running the vehicle with this issue will cause complete trans failure!!

I do not know about a Jag. But the "fail safe engine mode " on my GMC means the Engine Controll Computer has quit working.

When this happens, usually you have to replace the Computer. There is a chance you just didn't reset it when you took to cables off. Remove them and tape or hold them together for 5minutes or longer. If it still does it, I would get a book and find out where the code is to lead you. With the obd it only gives you a starting point in the diagnosics. You may have air in your lines that need bled, a sensor out, or just plain adjustment of the cables. But it shouldn't go into limp home mode unless you lost your Engine Control Monitor. Oh, I didn't click the read more button. Check the E-brake cables. You may have run over something that hooked it and ripped it loose. The Jags can tell if the cable is too far out of adjustment. It's under the car, cable should go through the floor and run to the rear of the car and Y out to the rear wheels. Good luck.

Hi Jagman

I suspect this could be your battery at fault.

Get it heavy discharge tested first.

Good Luck.

John.

Probably, your ZP HP-series transmission has failed. You didn't mention your car's mileage but failure is common from 60K - 120K miles. The "lifetime" synthetic fluid accumulates metal dust beyond the filter and magnet's ability to capture it, and sudden and catastrophoic failure occurs. Find a good independent shop (check your local Jag club) and they'll replace the transmission for around $6,000. The dealers charge twice that.

The other possibility is failure of the secondary cam chain tensioners. If you hear a clattering sound when you start the car, turn it off immediately and have the car transported to a good Jag shop. They can replace the plastic tensioners with metal ones for around $3,000. (Rough guess.) Make sure they do the same with the plastic primary tensioners and chain guides, and replace the chains. Failure to take this step after you hear the first symptoms will result in engine failure.

Also replace the plastic water pump and thermostat with alloy units.

Sorry for this bad news. I own a 2001 XJR and it is a fabulous car. It's still a Jaguar, though, and you're going to have to put a few thousand into it. Since these cars are selling for next to nothing on the used market ($12,000 for 80,000 miles), I consider preventive maintenance of $5,000 or so to be part of the investment in a world-class sedan.