The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free. I caution you on accepting any advice on what the problem is from a parts counter person, they are not trained and could cost you allot of hard earned money. Once you have the fault code post it here and I or another expert will take a look at the possiable casues.
I have had this car since 2008 & it had 17000 miles on it. In 2010 while it was still under warranty this check engine light came on 3 times, with the same code dtc po455. the 1st time they just turned off the light, 2nd time they replaced canister and reset the light. they told me if it came on again to wait till the tank is almost empty so they could do a smoke test. That never happened. Then they accused me of over filling the tank???? The 3rd time they replaced prge valve check hoses.lines and connectors, then they cleared the light. The car is now off warranty. But the light is still on, along with the air bag light.
The check engine and the airbag warning lights are not related and each requires a separate diagnostic procedure. As far as the P0455 goes it is likely the fuel tank pressure sensor is defective, this signals the control module (PCM) that your system is not holding pressure and therefore has a leak in the evaporative control emission. system.
Don't take your car in for recall or you'r big probems
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Replace the gas cap & see if that works-cheap fix if is. If not, my 2003 had a leaking valve cover & was discovered by the smoke test at OLeary's Auto Service in the Leland, NC location. They also have location in Wilmington, NC. Only go to certified auto mechanics & not back to dealer service deptments!!!!
SOURCE: hi i have Hyundai Elantra 2007 its EPS light
Hello... This light indicates that you might have a problem with your Electronic Power Steering (EPS)...
Have a shop check it out...
SOURCE: 2003 Hyundai Elantra
NO. These models do not have warnings on the transmission failure. There is warnings only when the transmission encounters electrical component failure, overheating(some cars), low fluid. Usually the warning is the O/D flashing light, or a seperate transmission light. Hopefully this helps
SOURCE: 2003 Hyundai Elantra GLS. Check engine light, code PO133
Did you use a aftermarket O2 sensor or a genuine Hyundai one? If it's an aftermarket one it may be bad or not as good as the OEM one. See here for more details and other potential causes: P0133
SOURCE: 2003 Hyundai Elantra Check Engine Light On
Could actually be the gas cap loose or bad, but the best thing to do is go down to your local auto zone and get them to put the scanner on it and see what's showing up.
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