2004 Cavalier Check Engine Problems

I have had a plroblem with my check engine light comming on for quite some time now :banghead: .
I've been getting DTC P0455 Evaporative Emissions Control LEak (Large) and can't seem to find the problem. I've changed the gas cap a few times and haven't noticed any fuel odors around my car.
Just recently I also got DTC P0480 Cooling fan 1 control circuit malfunction.
I have no idea what to do for either of these problems. Any advice anyone could give would be greatly appreciated.

Thanks

I have had a plroblem with my check engine light comming on for quite some time now :banghead: .
I've been getting DTC P0455 Evaporative Emissions Control LEak (Large) and can't seem to find the problem. I've changed the gas cap a few times and haven't noticed any fuel odors around my car.
Just recently I also got DTC P0480 Cooling fan 1 control circuit malfunction.
I have no idea what to do for either of these problems. Any advice anyone could give would be greatly appreciated.

Thanks
VENT VALVE!!!!!!!!!! Just had it done....

a 2004 cav? wow! anyhow all these cavs have these "emission" problems. mine is 0440, 0445 and some other shit....could be my vent valve or the filler in the tank, maybe i should try the gas cap.

a 2004 cav? wow! anyhow all these cavs have these "emission" problems. mine is 0440, 0445 and some other shit....could be my vent valve or the filler in the tank, maybe i should try the gas cap.
I would get them to check the vent valve first...And make sure that your gas cap is on really tight! Thats what my problem was!

ya, my cap is loose...vent valve? hmm.

ya, my cap is loose...vent valve? hmm...
Yepperz, have it checked...also.....Positive Battery terminal and fuel filter!!!! I have been running supreme fuel in it and it has been fine!

ok thanks.

Your Welcome....Let me know if it helps!!!

I corrected the P0455 code on my 04 Cav by replacing the "Canister Purge Solenoid". (located on rear right side by gas tank. You'll see a hose running from the 'cannister' to the solenoid.)

http://contentinfo.autozone.com/znetcs/product-info/en/US/wl2/PV155/image/2/ (http://www.automotiveforums.com/autozone/parts/Duralast-Canister-Purge-Solenoid/2004-Chevrolet-Cavalier/_/N-jlellZ9gsrq?counter=1&filterByKeyWord=vent+solenoid&fromString=search&itemIdentifier=363957_0_1481_)

(Part number PV155 from AutoZone) I think Napa has them also.

I have seen other reports that have found the 2 wire harness that connects to this Solenoid to be bad , but mine was fine, so I replaced the Solenoid itself, and the code has not returned.:smooch: