# Code P0456

**URL:** <https://community.cartalk.com/t/code-p0456/39453>\
**Category:** Power/Fuel\
**Tags:** jaguar, code, xk8, gasoline\
**Created:** [November 14, 2009, 2:57am UTC](https://community.cartalk.com/t/code-p0456/39453 "2009-11-14T02:57:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![TomSmith](https://avatars.discourse-cdn.com/v4/letter/t/c77e96/32.png) [@TomSmith](https://community.cartalk.com/u/TomSmith)\
**Post date:** [November 14, 2009, 2:57am UTC](https://community.cartalk.com/t/code-p0456/39453/1 "2009-11-14T02:57:02Z")

</div>

My 2001 Jaguar XJ8 has about 75,000 miles on it. For the last few months, the check engine light comes on. Each time I have had it checked, the Code was P0456. Apparently, the most common problem with this code is a defective gas cap. The current gas cap is a result of a recall when the car was about 2 years old. The dealer ran a test on the fuel line recently and determined that there was no leak. Is this often a false-positive code, or should I spend the money to have it checked out further? I am not very mechanical myself and know little to nothing about these things.