I bought Hyundai accent 2001 manual last week it

its located on the transmission itself, best photo i can find. its item 15

I think your problem may be MICE. Check your upper and lower O2 Sensor wires. I believe they are both 4 wire sensors. If a wire has been chewed through this is what happens. I personally had this problem myself once in my 2000 Hyundai Accent. GOOD LUCK.

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,

The noise you hear could very well be a lifter. But that is not what is causing your engine light to come on. The engine light problem can be diagnosed by having the codes read. You can have this done for free at most national parts chains such as Advance or Auto Zone. Good luck! I hope you find this to be very helpful!

Step 1. Find a OBDII scanner (OBD stands for On-Borard-Diagnostics). Find out what DTC code (or codes) are stored in the ECU (DTC = Diagnostic Trouble Code, and ECU = Engine Control Unit - it's the computer which manages engine operation).
Step 2. After you find out which code is stored in the ECU, go to http://www.hmaservice.com/ and register your veh (by VIN). Afterward, you can navigate the Hyundai Service Site to find out what system is giving you problems, the diagnosis procedure and what may be needed to fix it.
Nuff said... Let me know what you find.

check if the radiator has has a hole or if the tap is on. The tabis usually on the bottom of the radiator.

first clean the MAF mass air flow Vitally

Hi had a similar problem last week with my 2000 accent took car to dealer who put it on the computer, turned out that the 'mass airflow unit' needed replacing. Very expensive part cost £182 and labour £36 (Hyundai dealer) sorry!!!!

BAD SENSOR, OR WIRE CONTACTING THE MOTOR, DO A VISUAL INSPECTION OF THE BATTERY AND SPARK PLUG WIRES

if you over drive button and light is working check connections to shifter and gearbox and hope its not the gearbox