Check engine light is back on on a Hyundai Accent 2005

Did you reset?fill up a tank and reset, and see what happen.

would you describe the noise 1 metallic/scrapping, 2 slight roar ,3 squeal, 4 something else
1,loose drive belt pulleys, something may have dropped onto driven parts
2. loose or worn air intake hose , air filter box not secured
3. alternater etc drive belts , spray WD40 onto them when revving engine , if squeal goes check condition of belts
4. can you describe it
hope this gives you a starting point

all you did is remove it from the PCM memory ,if its a hard code it will be back, scan it if it comes back and find out what the code is ,then fix it not just erase it and disconnecting often can only lead to bad things happening , and bigger problems with computer ,that's called a no no

If you bring it to one of the local parts stores they will usually read the codes for free. Have them print it for you then post again with codes.Then we can give you some direction on what maybe wrong.

Dont drive a car with the light flashing. A flashing check engine light means that something is really wrong and you can damage the engine if you drive it.

What's the CEL code? Most mechanics try to avoid EVAP codes, if that's what it is.

I am having the same problem with my car and I have no idea what to do my check engine light would flash and go away when I would pull through gears now it is stuck on but when I shift it blinks sometimes the tranny was just replaces a couple months ago..

Even though you replaced the sensor, and the light went out, the computer still retains the original codes until the codes are cleared using a scan tool. It's possible the computer has put the engine in a reduced power mode because the trouble codes haven't been cleared.

well the first thing you need to do is to pull the stored codes in the computer and see what they say and then go from there, this could be a speed sensor or a trany going bad , i dont know if this is an automatic or standard trany, start with the codes from the check engine light, autozone car parts store will scan the computer at no charge,

It sounds like you have either a lean or rich condition ocurring,could be exuast leak,vac leak,leaking fuel preasure regulator,cat convertor.At this point would go to dealer for diagnosis.