Just a thought, there's a hellish big bunch of wires behind the front bumper that are known to rub on the chassis and give various problems. On the off side.

 

That tree trunk of wires has already been looked into and a repair done by my local dealer some time back while the car was still under warranty to fix a parking brake issue after the engine\bay was steam cleaned. A year or so ago I repaired the connector and loom that plugs into the heater solenoid due to a corroded wire inside the sleave. Electrical issues seem to have a bit of a thing for S-Types.

If it's just a wiring or simple sensor issue then bonus!! Anything else and i'll start thinking about remortgaging the house. :lol:

 

Quick update..... It turns out when the fuel filter was changed at 60k mile service it was plumbed back in reverse so the In-tank fuel pump has been working double-duty. New filter fitted and plumbed the right way but we still have this problem. Sensors and pcv are ok, as is the wiring so it can only be In-tank fuel pump or high pressure pump. Unfortunately Jaguar technical say you can't diagnose which one it is specifically so it has to be done by process of elimination. This is going to turn out be expensive any way I look at it.

Anyone got a good supplier of JAG parts?

 

I had a very similar problem with my Merc... :?: Turned out to be the high pressure sensor on the fuel rail at fault,showed all the same symptoms as you have.

 

That's exactly what i said to the jag mech about the fuel pressure sensor on the rail but he reckons it's working as it should. For the car to be running normally one second, switch it off, come back to the car after a few mins and then it's not OK the next minute is a bit strange. If it was a pump issues surely it would be giving some signs of trouble leading up to failure. My experience with sensors is that they can just decide to stop working without warning however, they have checked it's sending back all the correct voltages.

It's difficult to argue with the specialist as they are supposed to know what they are doing.

How difficult is the fuel pressure sensor on the rail to replace DIY? I don't have a workshop manual for mine otherwise i would do it. Does anyone have a workshop manual for a 2007 S-Type diesel??

 

Morning all and a happy new year

Finally got down to the mystery of this error code.

After much ado it turned out to be the high pressure pump and fuel pressure regulator. It's a Siemens pump.

Took it to the Jag Specialist in Ely and they did their diagnosis. They narrowed it down to either of the pumps but couldn't properly test either pump under working conditions because they have to be tested individually out of the car so off i went to the Diesel Specialist here in Northampton. They did all their tests and narrowed it further to the high pressure pump but they couldn't be 100% sure without removing it however they did say they were 95% sure so i went with that.

Bought the pump from my local Jag dealer which had to be ordered and shipped in from Germany. That arrived in a heavily taped up box which i duly delivered by hand to the Jag Specialist. The box it came in looked in a right old state hence why it was heavily taped up. Removed the pump from the box. Closer inspection revealed a broken connector at the bottom of the pump. This means it was either broken in transit or at the factory. I just hope nothing else on/in this pump was damaged. Thankfully the connector on my old pump was fine so that was swapped over.

The pump was fitted but unfortunately the engine wouldn't start at all so further inspection/diagnosis was required. It turned out the fuel pressure regulator although would run the old knackered pump, it wouldn't run this one so a replacement was bought and fitted. The engine then fired into life straight away and ran smooth as silk. Suffice to say the car now runs beautifully, in fact better than even before the breakdown. Job done!!

The Ely Jag specialist noted one very important thing when they had the car in and began the diagnosis/inspection. They discovered the fuel filter had been plumbed in back to front when it was last changed at 60K miles so they fitted a new filter and plumbed it in the right way. The 60K service was done by the Jag Specialist in Derby whom after that last 60K service i decided not to go back again as I really didn't get a good feel about them so i decided to look elsewhere for another specialist. The Ely Jag specialist thinks the whole fuel system was put under a lot of stress due to the significant extra effort required to circulate fuel against the flow of the filter hence putting fueling components under extra stress over a good 25K miles. It's understandable why there was a breakdown.

Just a couple of things come to mind. Should i of replaced the fuel pressure regulator before anything else, simply because a part of me wonders if actually that's all that was wrong with the car although it didn't show up as being faulty whilst under initial diagnosis by both the Ely Jag specialist and Northampton Diesel Specialist, and there was always something at the back of my mind thinking it was the FPR. I'll never know now.

Can i prove the Derby Jag Specialists error in fitting the fuel filter incorrectly, and can i prove this incorrectly fitted fuel filter was the cause of these component breakdowns in order to pursue reclamation of my repair costs from the Derby Jag Specialist in a small claims court. Do i have a case?? Any legal eagles here?? I still have the old pump but that is going back to the Jag dealer so i can claim back the surcharge that was paid on the new pump on an exchange basis, and i still have the old fuel filter which presumably will have dirt and grit lodge/trapped on the wrong side of the filter due to incorrect fitting.

This was not an inexpensive exercise and as such i'm pretty upset at having to shell out so much money both in fuel and work time wasted/lost going back and forth for diagnostics work, and in parts and labour for the repairs. Something tells me this could all have been avoided at the 60K mile service.

Was this just a genuine error, or was it done on purpose in the hope that we'd have to go back eventually for repairs. I can't help feeling suspicious about the Derby Specialist as dodgy garages are always in the news and so much of it goes on that i've heard of first hand from people i know.

Any thoughts/opinions?