Greetings!

I own a 2015 Jaguar XF and have had a check engine light visible for awhile now. The car overall has driven well. We have no smelled or seen gas on the driveway. We have replaced the gas cap twice with 2 different OEM has caps. We belive it is likely a small vapor leak. Can anyone tell me of they've experienced a similar issue and where they would look for a leak?

My father in law is our mechanic and does most of our intensive repairs but hasn't had the time to investigate what might be occurring.

 

I had an intake manifold leak at 65k miles that caused the check engine light. My mechanic was impressed how well the car ran with the leak. The computer did an amazing job of compensating. So I decided to have the symposer removed and capped off and have my cooling pipes under the supercharger updated as well.