Restricted Performance, Error codes
 

My XJR 2000 is my daily driver and has about 150,000km on it. Lately I’ve had Restricted Performance message come up and engine sounds and feels unstable. After turning the engine off, it seemed to go away for a while. Recently however the issue appears soon after starting the engine and will not go away.
I bought myself an ODB Bluetooth device (ELM327). I got the following error codes: P1601, P0352, P1797, P1642, P1638
I also did a hard reset. Still the RP message/rough engine and error codes appeared again.
The battery is only 1 year old and should be ok. I also did a gearbox rebuild many years ago.
I’ll probably have to take it to Jaguar dealer.
Will driving it in RP mode for like 15-20km have any negative impacts on engine/gearbox?
Any other advice on checks I should do?

https://cimg2.ibsrv.net/gimg/www.jag...fa7be5a161.png

Having a quick look through the codes, and there's 2 that pop out.

The 1642, you can check the ECM relay, could be faulty.
1638, a new engine coolant temp sensor? Or at least check the connection.

Have a look thru the attached code list....

If driving with RP does harm to the engine depends probably entirely on the nature of the root cause of the RP.

When I bought my X308 is came with RP - reason unknown - I did not have much choice though, but driving it with RP to get it home after I bought it. I my case it was the knock-sensor, and driving in RP with a damaged knock-sensor is probably not too dangerous.

But looking at your list 2 codes caught my attention:
Ignition coil B circuit malfunction, which could mean that you are not driving on all cylinders (= fuel in the cylinder is not getting burned, which, among other things, could damage the catalyst and Neutral Switch circuit malfunction, which indicates a transmission issue (old or low ATF? - but that is only a guess...).

So: I would not drive with it.

Thanks very much @Sean B
How do I check the ECM relay?
How do I check the coolant temp sensor?

Thanks @Peter_of_Australia
I might not have much of a choice if I need to bring it to the dealer.

Do they not have tow trucks where you are?

Misfire in cylinder number 2 needs to be addressed first. What you could do is swap coils from cylinder 1 to cylinder 2 and cylinder 2 to cylinder 1 since they’re right next to each other. I would also suggest looking down the spark plug tubes with a light and see if there’s any oil in there. There should be none in there but, if there appears to be a lot, then I would recommend getting that oil out of there. Clear the codes then start the engine. You might need to drive the car and see if the misfiring is there or not. What you’re looking for is to see if the misfire code goes from a P0352 to a P0351. If it moved then you need another coil to replace the defective one. If it didn’t move then check cylinder 2 coil electrical connector.

Thanks @Addicted2boost
I actually cleared the codes using my ELM327. I ran the engine for quite a while and all seems fine at this point. No error codes and engine seems to run smooth.
I will drive it to the dealer tomorrow and have them do a deeper check.

Since you cleared the codes, there’s not much they can do except take your money. I would personally forego the dealership experience and drive it until the code(s) come back.

^
If dealer diagnostic equipment can pull up previous codes - and I don’t know whether they can or not - then it might still be worth going in while the car is drivable…

Thanks guys,
I drove over to the Jaguar service center. All good until about 1km before arriving. Yup the RP message came up and my ELM327 showed only a P0352 error message again. No other error messages though. They did a check at the service center as well and told me it was the coil. I didn't have to pay anything and will get a quotation from them soon. Since it's the official service center, my experience is that it's not going to be cheap.
A quick look on SNG Barratt website and I find Ignition Coil DAC4608* for £34.33
I assume this is a job you should leave to a professional workshop?

> I assume this is a job you should leave to a professional workshop?

I am not leaving anything for a professional workshop.
And even if that wouldn't be my general stance, the next professional Jaguar workshop is so far away from me that it is totally out of the question.
I do not know further details regarding your coil, but swapping it sounds straight forward - except maybe having to remove the usual whole bunch of other parts to get access to the coil - depending on which coil it is.

As you don't seem to be the usual DIY-guy, I better ask, if you actually know, what a coil on a X308 is...?:
It's any of those 8 thingys stuck on the top of any of the 8 spark plugs making them spark...

Changing a coil is one of the simplest DIY jobs on a Jag.

Many thanks guys! I’m not getting the RP message all the time now, just after like 15min of driving.
I took off the cover for the coils on bank #2 just to look at them. That wasn’t too hard. If I get a new correct coil I think I should be able to replace myself.
Question now is what bank is my error P0352 referring to? The cylinder #2 on Bank 1 or 2 on my XJR 2000?
https://cimg6.ibsrv.net/gimg/www.jag...4967b3b67d.jpg
https://cimg7.ibsrv.net/gimg/www.jag...0e64498f77.jpg
https://cimg9.ibsrv.net/gimg/www.jag...cf68ad3a90.jpg

I see, you found the different diagrams for before and after 2002.5 already.
I found them in this threat, which asked the same question:
https://www.jaguarforum.com/threads/...late-to.85185/

But I do not think, the question was answer clearly in the thread above.
If I had to guess, I just realized, I probably would have guessed wrong, if the following comment is correct:

https://www.jaguarforums.com/forum/x...n-45755/page2/

Look at the entry dated 03-07-2014 11:50am by jimlombardy:
If that is correct, I'd say that if you stand in front of your car, it should be the second cylinder from where you stand on your driver's side (Tokyo driver's side, same as AUS and UK) 3303-07-2014, 11:50 AM

Bank One, cylinder two. Right side bank. . . .

> Bank One, cylinder two. Right side bank. . . .

So sounds like I got this one right then - if "right side bank" means now right side of the car, i.e. in driving direction, and not as seem when you stand in front of the car...

It's not easy for the car to diagnose the cyl so be prepared to swap to a different one in case that occurs.

When you remove the coil look for oil around the plug. It can cause a misfire. If there is oil you need to replace the valve cover gasket, a more involved job.

If it's that (oil leaking from the cam cover gasket) then you are still facing ONLY a fairly easy job.

https://www.jaguarforums.com/forum/x...e-swap-266724/

Now, don't be shocked if you look at all the pictures of my thread above: This thread is about the timing chains, so ignore most of it
But it also shows the only problem there is about getting the cam covers off:
Check out my 6th picture: I still do not know, what Jaguar was thinking there, but I tricked my way thru removing the hidden bolt under the non-removeable oil-measure-stick fixture, which covers that bolt. Meanwhile I read a thread here in the forum, where someone solved that exact same problem in the exact same manner - probably without reading my thread first...

However (and I am making reference to that issue in my thread above), if you discover after removing the cam covers, that the cam covers themselves are cracked, you job gets either more expensive or more difficult. I chose the latter and devised an odd way to fix the plastic covers (which should never have been plastic to start with...). The other way to solve that issue, would be to not only buy new gaskets, but also new cam covers.

If you can't find my reference in the thread above, here is the direct link to the cam cover issue:
https://www.jaguarforums.com/forum/x...covers-266148/