Took my XK8 for annual emission test today. The gas cap failed. I thought I would get a message or a DTC if the gas cap wasn't functioning properly. Ordered a new one from Gaudin.
Anyone else ever have this problem?

 

My gas cap failed inspection on my 00 S Type - never received any DTC either - purchased one from Advanced Auto - went back to DMV and passed.

Ordered an OES gas cap from www.amazon.com

 

Same story for me with the S.
They have a dedicated off the car check for the cap, so it could conceivably seal on the car and not on the test rig.
There was no doubt the seal had seen better days.

 

Every Jaguar I have ever owned has done this....

Ironically, like most I went to the local auto parts store and picked up a stant branded replacement. Took the car back and got it passed.

Two days later I got a check engine light. "Evap system large leak". I was like WTF? Cleared the code put the original gas cap back on, and it never threw a check engine light again. So I saved the "new" gas cap for emissions testing LOL.

Take care,

George

 

I couldn't find a stant brand locally to fit my 97 XK8 so I orderd an original from Gaudin Jaguar. Going with the same plan - save the new one for emisions test.

 

I really don't think the testing guys have a good testing system or equipment. The first time I got my 95 XJ6 tested right after I got it eight years ago the tech guy broke the cap. It jammed in the testor. I had to order one from Jag at $50. Went back to same tech guys and they cleared the code and passed it. I always go to same place and they have never checked the cap again. I always remind them they broke it once before.