OBD code PO456 on a 2002 XC70 - how to fix?

iamjoe · Post by **iamjoe** » 16 Mar 2009, 12:01

Just got the code read from autoZone. My gas cap was not on correctly which I guess lead up to this problem. How can I get rid of the check engine light? Cap is on correctly now.

Thanks

Post by **MadeInJapan** » 16 Mar 2009, 18:12

They can actually turn it off with their scan tool but may not be allowed to. You can ask to see the tool and hit the "erase" button...or you can keep driving it and it will go off on its own if it is truly the gas cap that did this. Another option is to disconnect the battery and then reconnect it. If you do this, have your key in position II (III is starting your car) as you reconnect it. This should clear your codes but beware, if you have an emissions test coming up, it might show the car is not ready for quite some time.

iamjoe · Post by **iamjoe** » 18 Mar 2009, 08:03

Thanks madeInJapan. If the code does not go away on it's own, where do I look to check about evap emission control system leake very small?

Post by **MadeInJapan** » 18 Mar 2009, 19:48

Well on an '02 it's a bit more complicated than on other cars- it could be:
1. Once again the gas cap- maybe the fitment isn't good.
2. A hose called the "J" hose which is near the gas inlet (where you pump the gas in) that helps relieve pressure.
3. The charcoal cannister or it's connections that are either broken or have a crack in them.
4. There may be others-
The only way to really check this is to get under the car and follow the gas line to the front of the car, paying close attention to all of the sub-lines for cracks....
Since this occurred with a bad gas cap situation, I'm thinking it will remedy itself after awhile.
Do you have any driveability issues?

Post by **cn90** » 13 May 2022, 13:05

Hi guys,

The 2004 V70 with 128,600 miles developed a P0456 code (small EVAP leak).
Gas cap seal is intact.

Does anyone have a S60 EVAP diagram? I just want to understand the difference between these 2 valves...

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: EVAP-Valves.jpg (31.74 KiB) Viewed 855 times

Post by **abscate** » 14 May 2022, 02:25

About $7

If it shares the p2 platform evap, here it is…