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Discussion Starter #1 (Edited)
I have a check engine light on, I have replaced all relevant sensors, vent control valve, fuel cap, even the charcoal canister. I am at my wits end with that dam light. Car runs fine just can't pass the Texas state emissions test.

Somebody suggested I put some type of jelly cream sealant (don't remember the name of it) on my gas cap, and I tried that but still light comes on. The mechanic (friend) that replaced the Charcoal canister as well as all the other components stated that its got to be the computer, told me I should take it in to the dealer and have computer washed or flashed, any thoughts on that?

Does anyone have any new suggestions for this problem?
 

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09 Altima 3.5SE 6MT Sedan
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So it's a BIG leak--as I read 'em those codes mean the tank doesn't develop a partial vacuum like it expects to. So unless there was a wiring/connector issue with a sensor, then most likely remaining cause is your gas tank isn't sealing somewhere. So, check for leaking fuel pump gasket, defective clamps/hoses, crack in tank or filler neck. If evap lines running from tank to engine are metal, check for corrosion.
 

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Discussion Starter #3
So it's a BIG leak--as I read 'em those codes mean the tank doesn't develop a partial vacuum like it expects to. So unless there was a wiring/connector issue with a sensor, then most likely remaining cause is your gas tank isn't sealing somewhere. So, check for leaking fuel pump gasket, defective clamps/hoses, crack in tank or filler neck. If evap lines running from tank to engine are metal, check for corrosion.
Thanks for those ideas.
 

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I have a check engine light on, I have replaced all relevant sensors, vent control valve, fuel cap, even the charcoal canister. I am at my wits end with that dam light. Car runs fine just can't pass the Texas state emissions test.

Somebody suggested I put some type of jelly cream sealant (don't remember the name of it) on my gas cap, and I tried that but still light comes on. The mechanic (friend) that replaced the Charcoal canister as well as all the other components stated that its got to be the computer, told me I should take it in to the dealer and have computer washed or flashed, any thoughts on that?

Does anyone have any new suggestions for this problem?
Evap canister purge control valve...they tend to get stuck... inexpensive part but can be hard to get to, however it can be done in less than 30 minutes, start to finish. I had the same P0455 code on my 2013 Maxima SV, tried everything else to no avail...then replaced the valve and have not had a problem since. This is not the valve in the engine compartment, this one is under the car, near the fuel tank and connected to the charcoal canister. Dealer will charge one hour labor to trouble shoot...the part casts less than the labor.
 
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