Hi everyone! I have had problems with my XF since buying. While driving down highway car loses all power cause shutdown and no power steering very scary going 70 mph down highway. After car stops still in D I then proceed to put car in P. Turn car off. Go to crank back up and IF it cranks at all it is very rough and I go a few miles then bam!! Same thing happens again. Get to where I'm going park it for a few hours go out to crank XF and everything starts fine I do this 10 times without a problem starting. Then when return to driving it all happens again complete shut down and rough starting. I feel very unsafe driving car anywhere. I recently took car to a foreign/domestic mechanic shop they found that a couple wires have been chewed by rodents due to fact of soy wire casings. Thought that was the fix to my problem. But no not a day later the same incident occurs. Someone please help me figure what this is so I can make suggestions to mechanic for a fix.

 

Your problem is very likely that same rodent problem - possibly further damage not found in the first repair (or a less-than-thorough repair). This type of damage is not in any way a "Jaguar issue" - it can and does happen to any sort of car. The destructive beasts can be rats or the rats with bushy tails known as squirrels.
On the V12 Jaguars of the 80's and early 90's there was one delicious wire (from the pick-up in the distributor); it was coated in a soft pink material that rodents absolutely LOVED. The problem was that the no-start or intermittent start or sudden "failure to proceed" was difficult to diagnose because the wire was hidden in the V of the engine under the cruse control bellows and AC compressor. An experienced Jaguar person would know to look there first. A general mechanic would not have a clue.
Your engine is entirely different, of course but this sort of damage still occurs (my son's 2017 F-Pace, for example suffered exactly this sort of rodent damage; when the car was taken to the Jaguar dealer they quickly found the problem and told him that they have repaired lots of rodent disasters).

 

Yes I thought that maybe the case that the wire weren't throughly checked all through out so I took it back to shop for that reason they check all wires and found nothing.

 

Ok...then we go to battery, battery connections, and main battery ground connections. Modern cars, not just Jaguars but all computer-stuffed cars, need full battery voltage at all times. When they do not get full voltage, various and random modules produce odd symptoms: warning lights, touch screen going blank or freezing, seat and window modules not working properly...your battery can test as being at full charge but still be faulty under load. If you don't find a different cause, verify the entire electric supply chain.

 

This is last straw SWAG. I have no knowledge of late model Jags. However, I had the same problem with my 1995 XJS AJ16. Shut down suddenly. Recovery service took to local Jag shop. They found no problems. Back on the road for about twenty-miles, full shutdown again. Recovery back to shop. Shop did a diagnostic again. No problems found. In the shop for 3 days undergoing diagnostics and mechanic SWAGing. Culprit was the crank shaft sensor. Newer models might not have crank shaft sensors.

 

Clean your mass airflow sensors. Any codes or pending??

 

Well that was my first thing I did when car started malfunctioning. Went to Jag dealership and got a brand new interstate battery. So battery is still good and all connections are good. Any other suggestions? I feell your on right track. Everything you've mentioned has come to my concern.

 

Fuel pump? Many are dying in the last year.

 

Hey Trevan. Went through pretty much the same issue with my 11 xfr. Died at a light one day. Car fired right back up and then a few days later car shutdown while turnign a corner and would no longer start. After finding the transmission release and having the car towed a code was finally thrown pointing to the fuel pump. Had it changed and everything has been good so far. Initially thought it was the battery so started with than but same issue cropped up and car shutdown again shortly after starting up.

 

Did it not store the special flight data recorder code? (Which ordinary tools don't understand.)