I suggest that before replacing the throttle body, investigate having the old one rebuilt. It will be warranted and will cost about $500 to get done. Same life and a savings of $300-$400. The 4.2 throttle bodies have two TPS's in them and both have to be replaced. There is more to them as well...since the car is drive by wire, there is a large stepper motor in the throttle body that moves the throttle plate as well and it does not last forever.

 

I HAD THIS SAME PROBLEM. I did my own troubleshooting, which also led me to the throttle body. As I began to remove it to clean it real good, I say that the plug for the throttle position sensor was deteriorating. A pin in the plug had backed out of the harness. I mended the plug with the proper wiring tools and adhesives (electrical tape will do it too) and reattached the plug, the whole problem went away. I know of two other people personally had the same issue. Both of them were instructed to either replace the throttle body or the Throttle body position sensor. I inspected the wiring harness and found the SAME EXACT plug on theirs was defective. I fix them, both of those XJ are still on the road. So, be sure to check the wiring. Never let a $10 problem turn into a $BIG$ problem. Good luck.

 

I have the same problem, Have you got your car back with a new TB? Has it solved the problem?

 

Check the plugs on the TB and be sure they are clean and tight. I use contact cleaner, tighten the contact and use di-electric grease. If a TB rebuild is necessary I can recommend ASI from my experience with them. I had my TB rebuilt for $508.00 and have a warranty to go with it. I have all the information on my page Jaguar XK8 Throttle Body R&R

 

Man, you guys describe my S-Type's complaints to a Tee. Parking Brake, DSC and I got a tranny light for a minute the other day. I know my throttle body is dirty, I saw it cus I had the air tube off when I changed that monstrosity of am upper radiator hose. Who'd have thought that it would cause the parking brake not to release...?

 

I have to tell you that I'm going to try this out first
What I do know is that I washed my car at a car wash and it happened and the 2nd time it was raining so I believe you hit it on the head because 2 weeks later between the same issues and the common was water
Thank You for the info

 

The first time mine did the deed it was after a trip to the car wash that included an under body wash. Usually, I don't take trips afterwards, but this time I went a couple hundred miles out and back on a day trip. I think that let water in a few places get turned to vapor and mist around. As stuff cools down it will pull in any moisture that is present. It's like sweating a pipe joint with solder. Cleaning plug cleared out the fault code and it ran great. I find that every couple of months or so I still need to unplug and replug the 4 wire connector at the throttle body several times.

 

Thank you everyone for all of your post. I am learning so much. I have a 2005 S Type with 87K miles and got the Engine SystemFault/Park Brake Failure/DSC Not Available. A Jag has always been my dream car. I will try cleaning the throttle body and clean the TPS. On a scale of 1-10, where does one need to be mechanically to "do it yourself"

Jag 2005 SType 87k 6cld

 

Hi mystype2005,

There are many maintenance and repair procedures you can perform on a Jaguar with only the most basic skills and tools, as long as you are willing to do your homework so you know exactly what to do and what not to do. And the more basic tasks you perform successfully, the more tools, knowledge, skill and confidence you will acquire, until you realize that there are very few tasks you can't perform yourself!

Cheers,

Don

 

On S-types, the number 1 cause of the faults you've seen is a failing battery.

 

It seems I make up the minority here as I have recurring DSC, PB, engine fault with fresh battery and TPS connector cleaning. Will do the throttle body cleaning and see how it goes..,

 

Just to jump in... Found out on My 05 XJ the problem was two-fold
A. still had the original battery (9 years old)
B. Wife had fueled up with 87 regular (with the 10% ethanol)
new battery, fresh premium 93 fuel, and cleaned the MAF, no more of this issue for 4 months & 3000 miles now.

 

I was having the same problem with my 2004 VDP on an intermittent basis but with the failures becoming more frequent. A large dealer diagnosed the problem as speed sensors (although I suggested it might be related to the throttle body) and replaced 2 sensors, but the problem continued. I cleaned the throttle body as described in the thread. It was quite dirty. I also used a separate special spray cleaner on the mass air flow sensor (spray only - do not touch sensor). I did this early in January and have not encountered any failures since then - although my confidence is not fully restored. I expect periodic cleaning of these items will be part of my routine maintenance.

 

USMC1211 reminded me that when I cleaned the throttle body I also noted deterioration of the plug to the throttle body and did some repair to strengthen the plug. This might have been a key factor in correcting (at least to date) the problem. It would certainly be a good idea to check the condition of the plug as you are trying to resolve the issue.

 

I had to replace mine about a month ago. They are down to $186 +labor. I have a thread on here detailing what I went through. I experienced the same symptoms as the OP.

 

I've been getting the same dreaded codes. Read all these posts and have sprayed the MAF sensor, retired the TPS harness (broken male plug) and have replaced battery. Next is cleaning the throttle body, tomorrow morning. If that doesn't do it I'll be looking for the least expensive new TB to replace myself this weekend. Love my 2005 X350 but this one has been a pain in the butt.

 

Without doubt, it's the TPS itself that is the cause of these problems.

Luckily the TPS is now available in the aftermarket, you don't need to buy a complete new throttle body or risk it with a used one.

The TPS is a Denso 198500-3300, same as used on the X-Type, and the later S-Types.

Some on ebay right now

198500 3300 for 02 04 Jaguar x Type 2 5L 3 0L B984 Throttle Position Sensor | eBay

and

B984 Throttle Position Sensor TPS for 02 04 Jaguar x Type Brand New 198500 3300 | eBay

 

Well, I had the fault condition one time while driving (2005 XJ8L) 2 weeks ago. The car suddently went into "limp mode" with all of the fault conditions for the first time (99,957 miles). I took the car to the dealership the next day, after performing some research here on the forum (I am definitely not mechanically inclined). The dealership encountered the problem upon a diagnostic test drive. They installed a new Throttle Body for $606.74 (parts and labor).

 

Hi Cambo,

That is terrific information! Do you happen to know if the supercharged cars like our X350 XJR use the same TPS?

Thanks,

Don

 

www.ebay.com/itm/JAGUAR-S-TYPE-X-TYPE-XJ-THROTTLE-BODY-NEW-OEM-XR845053-WITH-TPS-/251584518094?pt=Motors_Car_Truck_Parts_Accessories &hash=item3a939b17ce&vxp=mtr



Throttle body $185.22
Complete with TPS sensor. Brand new.