I keep getting the code 440, Evap emissions control malfunction....replace the gas cap and it goes off for a couple days then comes back on....wtf?!!

I'm also getting code 140, Bank 1 sensor 2 (after cat o2, I have a leak in the exhaust there), and code 171, Bank 1 fuel system too lean. I do need to replace the fuel filter as the car has 126k and the original filter, but do you think the 171 and 440 codes could be related by chance?

My gas gauge needle also fluctuates about 1/8 of a tank when the CEL is on??

Any thoughts or words are appreciated.

Jason

Your code p0171 could also be related to the other o2 sensor code, replace the sensor, clear the codes and then drive it and see if it even comes back.

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check the evap canister, when i first got my car, got a code, ended up being a leak/faulty evap can... also check your gas cap for sealing


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rich grayo jr. wrote: 0440 relates directly to the evaporative emissions system. the parts that it monitors include (from stern to stem): the gas cap, the gas fill neck, the gas tank, the gas tank pressure sensor, the vacuum lines running from the tank to the evap canister, the canister itself, the valve on the canister, the lines from the canister to the purge valve, the purge valve itself, and finally, the line from the purge valve to the intake manifold.
if any one of these 16 parts is faulty, it could trigger the 0440. the most common place to begin diagnosis is with the gas cap, as if not screwed on tight enough (by yourself or the gas station attendant) -or- if the rubber on the cap has degraded enough to not make a seal, then this code could be thrown. a gas cap should not cost more than $6-$8 at your local parts tore. next, a visual inspection of the lines to see if any are cracked, broken, kinked, or otherwise pinched off/leaking. if, after these inspections have been made and determined to not be the cause of the problem, i wold recommend getting your emissions system smoke tested.the parts after these simple diagnoses can get quite expensive depending on where you get them from, and as such, you'll only want to change the part thats causing the issue.

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