# Volvo xc70 code po456

**URL:** <https://community.cartalk.com/t/volvo-xc70-code-po456/18268>\
**Category:** Maintenance/Repairs\
**Created:** [August 16, 2008, 8:06pm UTC](https://community.cartalk.com/t/volvo-xc70-code-po456/18268 "2008-08-16T20:06:52Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![janliang](https://avatars.discourse-cdn.com/v4/letter/j/51bf81/32.png) [@janliang](https://community.cartalk.com/u/janliang)\
**Post date:** [August 16, 2008, 8:06pm UTC](https://community.cartalk.com/t/volvo-xc70-code-po456/18268/1 "2008-08-16T20:06:52Z")

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My volvo xc70 check engine light came on. My mechanic ran a diagnostic and found code po456 small evaporative leak but he could not find any leak. He cleared the code but the code came back 2 months later. Any idea what’s the problem? Do I have to take it to the dealer?

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**Author:** ![Constantino\_Tobio](https://avatars.discourse-cdn.com/v4/letter/c/edb3f5/32.png) [@Constantino\_Tobio](https://community.cartalk.com/u/Constantino_Tobio)\
**Post date:** [August 16, 2008, 8:09pm UTC](https://community.cartalk.com/t/volvo-xc70-code-po456/18268/2 "2008-08-16T20:09:31Z")

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Possible loose gas cap, though I more regularly see P0440 get thrown by this. Its possible that it is a different code this time.

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**Author:** ![budd2049](https://avatars.discourse-cdn.com/v4/letter/b/77aa72/32.png) [@budd2049](https://community.cartalk.com/u/budd2049)\
**Post date:** [August 16, 2008, 8:11pm UTC](https://community.cartalk.com/t/volvo-xc70-code-po456/18268/3 "2008-08-16T20:11:03Z")

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Odds are the gas cap is loose or not sealing properly. Outside chance of a leak in one of the evap lines.

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**Author:** ![janliang](https://avatars.discourse-cdn.com/v4/letter/j/51bf81/32.png) [@janliang](https://community.cartalk.com/u/janliang)\
**Post date:** [August 16, 2008, 8:21pm UTC](https://community.cartalk.com/t/volvo-xc70-code-po456/18268/4 "2008-08-16T20:21:38Z")

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Thanks for your quick reply. I have in fact put on a new gas cap but the code hasn’t gone away.

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**Author:** ![cod\_fragger](https://avatars.discourse-cdn.com/v4/letter/c/e47774/32.png) [@cod\_fragger](https://community.cartalk.com/u/cod_fragger)\
**Post date:** [January 13, 2010, 6:13am UTC](https://community.cartalk.com/t/volvo-xc70-code-po456/18268/5 "2010-01-13T06:13:14Z")

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Smoke machine is the best tool to find evap leaks…failing purge valve,charcoal canister,hoses must be checked leaks…