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I have a 1999 Pontiac Sunfire and I had a cjeck engine light come on. I diagnosed it with my OBD 11 and it came up with a 440 code. The gas cap is on tight, where do I go from here Thanks Keith
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You need to check engine codes to determine which circuit is giving you the problem. Have a visual inspection under the hood to make sure no hoses etc are disconnected
oxygen sensors, purge canister (if has filter replace) pressure sensor gas tank. google OBD II Codes, will give you what triggers the code helpful for troubleshooting
Yes, if the gas cap is not on tight enough or if you took the cap off with the engine running, this could very well be the problem. It will usually set one or more of the following fault codes: P0441, P0442, P0455, or P0456. I usually do not recommend getting the "free" scanning done at the local parts dealer, but this is one case where I would actually recommend it. Have them scan your OBD system. If one of the codes above are present, just ask them to clear the codes for you. Make sure your fuel cap is tight and see if the light comes back on (if it does, then you will need to diagnose to find out why). If there are any codes other than those listed above, then you should get your vehicle diagnosed to find the cause of the code or codes.
Just have the code read.You can have this done at Auto Zone or O`riellys.They will check it for free.Just cause the check engine light came on does not mean the car is done for.Get the code and get back to me and I``l help you figure out what is causing it to come on.Does the car run any different since the light came on?Let me know.Good luck.
When the light is on you need to pull the OBD codes with a code reader or go to an autopart store and have them do it. With that in mind ethanol changes the exhaust coming out of the engine, the ethanol causes the oxygen to be higher in the exhaust than is expected and the light comes on. You should have the codes checked to be sure. However there is no damage coming from this light, if that is the cause.
I would say start by replacing the gas cap with a genuine GM product. If that doesn't fix it there are a few more suggestions here --> P0440 @ OBD-Codes.com
code OBD II P0441 states incorrect purge flow.. Check all your vacuum lines at the purge canister and tank too, and check your gas cap to make sure it is on tight. When all else fails, have a local autoparts store scan it with their scanner for free to see what they suggest.
its a small evap leak, could be gas cap, or filler neck, or ring at top of fuel tank to secure the pump. if you are in a rusty area, the necks are bad about a hole rusting in them.
Your problem is typical for these cars. The throttle position sensor is bad. Go to Auto Zone and have them check the codes to confirm this. i've seen this many times, that's usually the problem. It makes the car feel like the brakes are on. Hope this helps. Let me know. Phil
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