2002 Nissan Xterra Code PO456

[AnthonyS]

Anyone ever experience this Error Code? It causes the Check Engine Light to trip. I did some looking and it mentions the EVAP Leak. My mechanical ability is limited, but am willing to try.

Anyone ever have this problem? How did you resolve it?

Thanks

 

[drbandkgb]

If I remember right this is next to the passenger side front tire.. There a hose there..

 

[Cyclemut]

Evap Small Leak.

Check your gas cap, insure that the seal around it is in good shape. Then look in the engine compartment, near the ABS module area for a hose with a green screw on cap. You'll see that it goes to a solenoid. The other line from the solenoid will go to the engine. Pull both lines off the solenoid and look for small bits of charcoal inside. If you don't find any, good, because if do find some, that means that your charcoal canister has come apart and you'd need to replace it.

Look for any cracks in the vacuum lines to/from that same solenoid. There's only the two.

If all that is good, then you'll have to inspect the rest of the fuel vapor recovery system for cracked lines (rubber). You'l also have to look at the vent control valve on the charcoal canister for proper sealing. But typically, if that fails, it'll throw a P0455 (Gross Leak).

Do some easy checking, but look at your gas cap. If you think it needs replaced (vs just being loose after a fill up) then get a genuine Nissan cap. Most aftermarket ones will cause another code.

 

[AnthonyS]

Evap Small Leak.

Check your gas cap, insure that the seal around it is in good shape. Then look in the engine compartment, near the ABS module area for a hose with a green screw on cap. You'll see that it goes to a solenoid. The other line from the solenoid will go to the engine. Pull both lines off the solenoid and look for small bits of charcoal inside. If you don't find any, good, because if do find some, that means that your charcoal canister has come apart and you'd need to replace it.

Look for any cracks in the vacuum lines to/from that same solenoid. There's only the two.

If all that is good, then you'll have to inspect the rest of the fuel vapor recovery system for cracked lines (rubber). You'l also have to look at the vent control valve on the charcoal canister for proper sealing. But typically, if that fails, it'll throw a P0455 (Gross Leak).

Do some easy checking, but look at your gas cap. If you think it needs replaced (vs just being loose after a fill up) then get a genuine Nissan cap. Most aftermarket ones will cause another code.

Thanks for the info. I have the CarMD tool to check your cars diagnostic codes, etc. The PO456 in the CarMD definition is in fact a Gas Cap issue. I checked and the cap seemed to have only ONE turn on it. I took it off and didn't notice any corrosion on the cap or the tank bung.

I do tend to overfill my tank all the time. If the price on the gas pump comes to $55.25, I like to round it up to the nearest dollar. I was reading this is not always a good thing. When the gas pump handle STOPS, so should you. LOL

I did check the vacuum lines. I didn't notice any cracks, hissing or visible leaks. I was also told since the CarMD tool suggested a Gas Cap, that I would need to drive at least 100 miles for the Service Engine Light would clear.

Is there a way to clear it other than going to Auto Zone, Advanced Auto, etc or just ride it out the 100 miles?

Thanks

 

[Cyclemut]

Disconnect the battery for a little bit (anywhere between 10-30 minutes) and it should disappear.

If you have the CarMD reader, consider a cheapo code reader from Autozone or the like that can erase the codes. They're cheap and you can keep it in the vehicle for trips and whatnot. That way if a light comes on and you just want to know what's going on and if you should stop driving it then, you'll have it.

I keep my cheapy reader in the vehicle at all times. Then I can read my wife's rig's codes at home too, if she leaves the cap loose too.