Good day folks,

Check Engine light in my 2005 XJR came on a few days ago and so I took it off to my local shop. They report the fault code is a P0442 fault in the evaporative control system, a possible leak in the charcoal canister's shut-off valve. Unfortunately it seems all their usual venues for parts do not have said charcoal canister available as a new part. I suggested SNG Barratt to them but they called SNG Barratt and were told they can't get hold of it either (and this seems borne out by the SNG Barratt site, which lists that part as "special order" -- https://www.sngbarratt.com/English/#...4-fd101e68f18a ) . They can't get the fault to occur again after having had the car for several days so for now we are adopting a "wait and see" approach to see if the fault returns or not. Our only other alternative right now appears to be ordering a used part and hoping it is in better condition.

In any case, can anyone else recommend another source for parts that might be able to get hold of this (apparently difficult to locate) particular part, if the fault does return? I did some forum searches with keywords "charcoal canister" and "P0442" and found nothing concrete, unless I'm missing something.

Thanks in advance for any replies!

cheers,
Phil

 

Phil,
Maybe have your shop vacuum/pressure test the purge valve. While the valve itself is under the LH wheel liner (I believe) on your model year, this simple test can be conducted from the engine vacuum line.
I believe the PCM checks to make sure that vacuum integrity exists between evap canister (close) valve and purge valve, so easy to check purge valve first. Also possible (and common) cause for that CEL may be loose or leaky fuel cap (check seal and filler neck sealing surface, particularly at bottom of sealing circle)

Hope this helps...

 

Thanks hisport! They've already buttoned the car up this time but I am making a note of this if the fault code does recur. I greatly appreciate the advice.

cheers,
Phil

 

Take a look at this thread. We have seen some of these plastic canisters develop cracks. That thread has a picture of what I am talking about.
You can fix it yourself or replace the part IF that's whats causing your code.

EVAP Canister

I stole this picture from that thread which shows where you want to look.



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Thanks clubairth1. From reading the thread you attached, it appears the "canister" being referred to in that thread isn't the same "charcoal canister" we were trying to locate. I am extremely un-mechanically inclined but if checking that part really is as simple as it appears to be in that thread then maybe I can at least inspect it visually.

I tried looking on the SNG Barratt site using the part number provided in that thread, XR830786. This turns up.........over 600 results, none of which appear to be related to "evaporative emissions canister purge valve resonator". Either they don't have that part, or I'm missing something. The linked thread is four years old so it's entirely possible the part availability is different now.

 

Yes there are 2 canisters in the EVAP system and the one in the picture I posted is the small one. There is also 2 EVAP leak codes. Large leak and small leak. Your code P0442 is the small leak one and points to the small canister. The large EVAP leak is P0445 for the large canister. Be aware that a loose gas cap can cause these errors too. Plus it's not exact on the division between small and large so sometimes one or both codes show up regardless if it's a big or small EVAP leak.

You need the last 6 digits of your VIN to get the correct part number for Jaguar's. They make running changes as time goes on. I see several part numbers in the JEPC (Jaguar Electronic Parts Catalog) for the large canister.



Part # C2C35068 is one possibility I got from the JEPC list but again without the last 6 digits of your VIN it's all a guess.
BUT that's good news if I got the correct part number because it has been superseded and appears to still be used on the late model XJ's (X351 models)!




Not sure about the part number you posted and it does not appear to be correct?
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Thanks again clubairth1 for your detailed replies. The part number I provided, XR830786, was taken from the thread you linked to. I wouldn't have a clue what the part number is otherwise.

Last six digits of my VIN are G39995, if that helps. Clearly I need to get a copy of this JEPC program for my own reference.

 

Thanks for the VIN and that does lead to yet another part number. I find the JEPC shows C2C9584. Which is also discontinued.
I think this means a used part is all you are going to get. EBay is probably the only place to find it unless you want to start calling junk yards on your own?

I do see Jagbits has a used one for $350!
Used Canister

So you would be far better off to find someone parting out a car like yours and ask for that part. You might need to tell them how to remove it from the car as it's kind of buried.
Hey we might have gotten lucky??
Here is a used one from a 2004 XJR VIN G25297 which is in the same VIN range as yours in the JEPC. He does NOT have the correct part number on this item and it's only $180!
I would get this right now! Note he also has make offer so you might get it even cheaper depending on your negotiating skills?
Used Carcoal Canister

Now please take a look at the pictures in that auction but they match exactly the diagram in the JEPC shown below.



If you would please report back if you get it repaired because with it being discontinued from Jaguar others will run into the same problem with no solution.
The JTIS and the JEPC are both free on this forum with a little searching around They are handy but like anything associated with Jaguar software they are crude and unfriendly to use at best!
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I'm sorry, I'm a little confused. You said the P0442 code I'm seeing is most likely to be linked to the small canister, and linked me to a thread about replacing the small canister, but now you're giving me part numbers for the large canister? It isn't that I don't appreciate the response -- I certainly do -- but I'm just confused as to which one is most likely needed. The old thread with details from Nixx as to how he fixed his issue was related to replacing the evap emissions canister purge valve resonator (small canister and linked with the purge valve assembly?)

If I were to try replacing anything myself, it would be the small one because the pictures make it look accessible and easy to replace. I am horribly inept with anything mechanical. For the large canister, I have no idea where it would even be. My shop mentioned they didn't even tear down to the point of inspecting the existing one because there was so much in the way. Without a new part, they said, it wasn't worth the labor to dismantle things to that point.

Again thanks much for your responses.

 

Sorry for the confusion! But the problem is these EVAP codes are not black and white. Yes I first directed you to a small leak thread. It's easier to troubleshoot because as you noted that canister is easy to get to and work on.
Sorry I did not see where you checked the small canister for cracks or leaks? Any hissing sounds around that area when the car is running? So you can eliminate the small canister yourself if you want to.

IF that does not fix it then it might point to the larger canister which is the second thing I pointed too. Yes if you can't DIY this I am afraid it will be expensive to repair. Your shop is right that the big canister is buried and on some cars the gas tank has to be removed. Not sure on your car?

Since your shop said the canister shut off valve I "think" that's integrated in the large canister assembly.
Did the shop find this with a smoke test?

In that picture I posted there is another valve attached to the small canister. It's also a possible suspect.
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I have not visually checked for leaks myself, but have not heard any hissing sounds in that area while the car is running. I do hear hissing sometimes AFTER the car is turned off, but I always assumed it was the compressor for the air suspension / air being let out of the air suspension. Maybe I need to open the hood before shutting the car down and see where exactly the escaping air is coming from. The annoying thing about this is that the shop was not able to get the fault code to recur over a period of a week, and it has not recurred since I got the car back from them. If the CEL does come on again I will try listening near the small canister to see if I hear anything.

No, they actually did not visually inspect the part at all. Because they were not able to locate a replacement part (except for used ones) through their usual channels, they said it wasn't worth the time and labor to tear down to the point of visual inspection if they already knew they couldn't get a replacement. If the CEL recurs, I will pull the small canister since it appears much more accessible and inspect it myself for evidence of any cracks. If I see any then I can maybe point the shop to that part instead (or, I guess, try some epoxy resin to try and seal the cracks?)

Thanks again for the input.

 

You might have gotten lucky?
Some of these codes can be caused by a loose gas cap or a failed gas cap. I always give the gas cap a couple of extra clicks just to make sure it's fully seated.
Keep an eye on it and just make sure you fully seat the gas cap.

The thing is the gas cap almost always sets the "small" EVAP leak code of P0442 which you had so maybe that was it?
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I will happily give that sucker several extra clicks every time I refill going forward. Keeping my fingers crossed. Thanks again.

 

Where is the small canister located? I'm having the same issue as OP, but the picture posted is of an S-type and I don't see anything like that in the engine bay of my XJ.

 

.........you know what, I never even noticed that the other thread clubairth linked to was in the S-Type forum. I just took a look and sure enough, my engine bay looks nothing like the photos either.

clubairth, does this small canister even exist on the XJ series that garethashenden and I have?

 

I think I found it. In this video of how to change the purge valve that little canister can be seen at the end. Its in the left front wheel well.

 

Yes the picture I posted was from the S Type forum. As you found out the XJ also has pretty much the same thing but hidden in the fender well.
If you watch the video you can see the small canister and it's the same as pictured on the S Type.
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I didn’t see a small round canister in the wheel well of my XJR when I was in there this morning. The purge valve is the only thing in that space. There is a rectangular canister attached to the valve and included in the replacement part. There was one spot that looked as if it could be the leak, but I’m not optimistic I found it. I did reseal the canister with epoxy just in case. Will get the code cleared and see if it comes back. Fingers crossed.

 

Sealing the canister by the purge valve didn’t really fix the problem, but it did reinforce at pattern that I’ve been noticing over the summer. The check engine light only comes on after a period of idling, never when driving the car. If I get stuck in traffic or sit in my car with the engine running, that’s when it will come on, not when I’m moving.

 

Are you still getting the same codes?

I had the exact same symptoms you posted but it was a vacuum leak code (P0171/P0174). What was happening is at idle the vacuum leak was big enough that the computer could tell and set a code and a check engine light. But when the engine load increased the vacuum leak stayed the same but was now a much smaller portion of the incoming airflow. So the check engine light would go off if I was driving and then come back on at stop lights when the engine returned to idle.
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