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TdotAlero · 11-26-2009, 08:59 PM

We all know that it means something to do with gas. In my case I figured out it was the infamous gas tank locking cap. Anyway normally I wouldn't just create a thread to rant about it but in the case of my car it's kind of a weird problem. So I had my check engine light on for a while, and I replaced my gas cap with a used one that came out of a Grand Am. The light was off for a couple of days and then came back on. I gave up until like a week ago when I filled up and the engine light disappeared. Usually after filling up it would still be on. Anyway I had no problems until two days ago when I left my key in the 'on' position. The light came back on. So I fixed the cap to turn the light off. It seems that whenever I just turn my car on the light doesn't come on, but if I leave the key in the 'on' position it comes back on. After re locking that gas cap it disappears. What can be causing it ? It only comes back on after leaving keys in the 'on' position. Would getting a brand new replacement cap solve the issue?

11-26-2009, 08:59 PM	#1
TdotAlero GL Member Join Date: Mar 2009 Location: Toronto Posts: 463	Check engine code P0440 We all know that it means something to do with gas. In my case I figured out it was the infamous gas tank locking cap. Anyway normally I wouldn't just create a thread to rant about it but in the case of my car it's kind of a weird problem. So I had my check engine light on for a while, and I replaced my gas cap with a used one that came out of a Grand Am. The light was off for a couple of days and then came back on. I gave up until like a week ago when I filled up and the engine light disappeared. Usually after filling up it would still be on. Anyway I had no problems until two days ago when I left my key in the 'on' position. The light came back on. So I fixed the cap to turn the light off. It seems that whenever I just turn my car on the light doesn't come on, but if I leave the key in the 'on' position it comes back on. After re locking that gas cap it disappears. What can be causing it ? It only comes back on after leaving keys in the 'on' position. Would getting a brand new replacement cap solve the issue? __________________ 2000 Oldsmobile Alero GL 3.4 V6 284.000km FOR SALE!!! 2008 Ford Escape Limited 3.0 V6 130.000km Follow the Southwest Ontario Meet thread!