Good morning all.
I recently had the check engine light come on and when I checked the code it reported that the canister purge valve ( LJB1515AB ) is faulty. My difficulty is that I can't find one in stock anywhere. It has also been suggested that the fuel system additive Guaranteed to Pass will help this condition. I can't imagine I'm the only one with this problem. Any insight to this problem and source for this part would be greatly appreciated.

 

There are a number of possible answers, twould be helpful if you could tell us what the code(s) were and what year your car is.

 

Be careful here. If I’m right, then that particular valve purges the air vapor above the fuel within the tank back to ambient pressure. It sends the vapor through the canisters to diffuse the smell.

*Hopefully someone can confirm this*

The risk is that if the valve has failed closed, then a long drive that burns a lot of fuel will cause a negative pressure that could implode the fuel tank.
Unscrewing the fuel filler cap and hearing a hiss sound would prove this condition....

 

You are thinking about the CCV (Canister Close Valve)

 

I have a 2000 XK8 convertible. I initially called a local Jaguar dealer and, based on the VIN, was told part # LJB1515AB was the appropriate replacement.

 

You may have to settle for a used one.

Jaguar OEM 97-06 Xk8 Vapor Canister Purge Valve Ljb1515ab for sale online | eBay

 

Assuming the problem is that the EVAP purge valve is fragged (e.g. P0442), these do not generally appear to be available except used. Since this is a fairly common problem, I went a second route with new parts. So,

There is a thread (as always) and a TSB (303-63 for me, see thread for the later one)

https://www.jaguarforums.com/forum/x...fusion-179542/

I recently needed to replace the purge valve (for 1999-2002 through A30644) since it was leaking. The original part (LJB1515AA or LJB1515AB) is not available new, but there is a new part (LJG1515BB) requiring a small 'improvement' of a vent into the box that holds the brake booster. I jury rigged this with a fuel filter, hose and cable ties, though I eventually got the actual parts (DAC4062 for the air filter) and (UKC6683 for the fancy cable tie) that I haven't put on. The jury rigged solution looks better, IMHO than the Jag solution. The new evap valve is widely available. Such as

https://parts.jaguarlandroverclassic...rol-valve.html
or
https://parts.harperjaguar.com/oem-p...alve-ljg1515bb

This may require an update to your ECM to make it work (engine computer=ECM, dealer, or someone with the proper software to do it). I happened to have replaced my ECM with a 2002 ECM for other reasons that fixed any potential problem with the programming.

It is also possible that wiring is the problem, so you might want to check that depending on what the code is.

Note: Rev Sam's video is helpful, but I found it to be very easy to turn the front wheels to the left stops, take the wheel well shroud out, and work on the evap valve without jacking or removing the tire, even with my relatively large torso. Videoing would be more difficult, but saves some time in practice if you're not doing that.

 

The valve is located near the rear axel between the two cannisters. You may want to do a visual inspection frist as it could be a leaking hose or shot o ring causing the leak. I replaced mine with a used CCV and it worked fine. I did purchase a new one to have on hand. The valve is made by Denso and the part number is LJC1525AC and should be readily available. I believe there is a "purge" valve up near a wheel well but my problem was with the "close" valve in the rear. I do not recall the exact code but the desciption was "slight evap emission leak"

 

Different valve. I believe that he is looking for an EVAP purge valve in the rearward side of the front left wheel well as you note.

dsteele525, do you remember the code(s) for your problem?

 

The label on the part in the photo says LJB1515AA.

 

Do you remember which codes were set (i.e. P0442, P0445, etc)?

 

The code I had for a bad cannister control valve CCV on my 2000 xk8 was P0442

 

I don't remember the code. When we plugged the meter into the computer the print out said canister purge valve failed.

 

Okay, great. So your options are to find a used one which will hopefully work, or buy the new part with the instructions above.

In NC, there is a third option, ignore it. Your car is old enough to not need emissions testing. I don't suppose this is okay in CA.

 

There is not a single one left in the United States. Is there a way to hotwire it so it does not trip the check engine light?

The dealer said they are looking for a new supplier for the part. I asked if that was an old note, but in the supply system that note was put in in Oct 2020, so hopefully the part is not gone forever.

 

If you're looking for the original part (LJB1515AA or LJB1515AB), you will likely have a long wait. I found none new in the US or UK about 18 months ago. There are used parts available, and the new part is LJG1515BB. The caveat with the new part is that your ECM will need reprogramming, I think.

It's a complex system interaction so it is questionable whether it would be worth trying to figure out what will satisfy the ECM without performing the function. (As an aside, a mite bit illegal too...)

 

Thanks for the reply. I am hesitant to take this old ECM computer in for updating, I may look for a used valve.

 

Safest/cheapest approach is to look for an old one.

Another is to acquire another ECM (about $100), and have that reprogrammed. That's a bit more expensive, obviously, with the ECM, the EVAP valve and the programming (unless you can do it yourself), but an option with no risk to your current ECM.

 

With no new stock available, I wonder how the states that require passing annual emissions tests will handle this dilemma. Here in North Carolina a recently-passed law exempts vehicles at least 20 years old, but right now the 2001-and-newer cars have to be tested and would fail if their canister purge valve is faulty....

 

A replacement ECM will only need to have the Immobilization Setup performed if the VCATS suffix is the same.

The replacement ECM needs to be introduced to the CAN bus for the engine to start and run.