XJ XJ8 / XJR ( X308 ) 1997 - 2003

P0455 (Gross Leak)

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Old Apr 3, 2025 | 09:02 AM
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X308TheKingCharles's Avatar
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Default P0455 (Gross Leak)

Hi Community,

I’m chasing a gas smell from the rear, particularly when the windows or sunroof are down or when the AC is not blowing (I occasionally get the P0455 code) I’ve exhausted most of the tips on the forum and where to look for leaks. Can anyone point me in the right direction on where to hook up a smoke machine so I can hopefully find a leak?

2001 XJ8
AJ27 Engine
 

Last edited by X308TheKingCharles; Apr 3, 2025 at 09:13 AM.
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Old Apr 3, 2025 | 10:22 AM
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Last edited by RandyS; Apr 3, 2025 at 10:28 AM. Reason: https://youtu.be/VvcFGzAyaXE
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Old Apr 3, 2025 | 11:06 AM
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Check the CCV. Lots of Service Actions for the XK about the valve but sedans use the same valve type so it might be worth looking into?
 
Attached Files
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310-09 P0455.pdf (88.5 KB, 26 views)
File Type: pdf
303-S837 Canister Close Valve.pdf (176.3 KB, 126 views)
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File Type: pdf
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Old Apr 3, 2025 | 12:40 PM
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Link to my homemade smoke machine: https://www.jaguarforums.com/forum/x...achine-256573/
My leaks were dried out o-rings at cannisters.
 
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Old Apr 4, 2025 | 01:34 PM
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Hi folks, thank you all for the suggestions. After another thorough inspection, I seem to have a hole in one of the tubes from the CCV. Will report back here after replacement to see if the gas smell goes away.

 
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