Chevrolet Cavalier Problem Report
Chevrolet Cavalier Check Engine Light Due to Gas Cap Issue
Illumination of the Check Engine Light may be the result of a loose or worn gas cap.
check engine light keeps coming on for a PO455(i think this was the no.) and it said evap leak large. I look around my fuel cap and there is raw fuel all over the seal, no matter how tight I tighten it, there is always some gas around the outer fuel cap. Changed cap 4 times. Check engine with same code keeps coming on. - Tim77
The engine light is on due to some issue with the gas cap however, I bought a new gas cap but the light it is still on. - Visitor
pulled in to station got gas then for two mounths check engine lite stayed on ,got computer tool and it said gas leak,then got gas one nite and lost gas cap,and got new one next day and two days later lite went out. - Lon w
light on dash board showing gastankk - Visitor
Check Engine light stays on due to the gas cap not on correctly - Visitor
gasket on original gas cap got cracks in it and did not seal sufficiently well. Also have to make sure to click it down 3 times to get the new one to seal properly. New cap did not have nice connector strap either. Check engine light would come on and had the code checked for free at the parts store and they told me what it could be so did the cheapest fix first after finding the cracks and that fixed the light coming on problem. - Visitor
got one out of junkyard, no light anymore lol - Visitor
Check Engine light came on, took the car to get it diagnosed. Turned out to be the gas cap. Replaced and the light turned off. - Visitor
The check engine light kept on going on and off. When I finally replaced the cap ($8 at Autozone) the whole cycle stopped. - mihaimazilu
Replaced initially with aftermarket cap. Did not correct problem. Bought OEM cap and code went away. - Visitor
Has not been fix and the gas cap has been replace - Visitor
same thing couldn't figure out, then realized was gas cap - Visitor
if i dont crank it twice closed the engine light comes on - Visitor
GAS CAP,GAS CAPSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS - Visitor
The check engine light comes on and off on my 2004 cavalier. It is a P0455 code I think which is an emissions leak. I changed the gas cap once, check engine light still on. Not sure if it is a larger problem or not. Luckily I don't have emissions testing where I live or I would be in trouble. - jeremy_mullens
Attendant in gas station gave me someone else's cap (both were on top of the pump). Check enging light came on. Bought new cap at Autozone today, filled tank. Waiting to see if light goes out in a day or two. - Visitor
none yet still looking - photobyfly
check engine lite on,dealer checked P0442 code found the upper filler neck leaking during the smoke test, ironically they had the part telling me this is a common problem (how often do they need a filler neck). - bigallen
Check engine light is on (steady light) and got gasoline a couple of days ago. Told that it mig...
My son's cavalier will suddenly not start. It was running just fine the night before and then t...
At the Echeck station they said because the light won't come on they can not pass my car so tha...
reset engine lite but it came back on approximately 50 miles later,
My "Service", "ABS", and "Low Traction" lights come on whenever I make a tight turn while accel...