Looking at buy this car but been told traction control light stays on. Is this a big problem?? Hyundai Grandeur XG 2000

I think you will find this link very helpful. Someone else appears to have had the same issue on a hyundai forum. I hope this answers your question.
http://www.hyundai-forums.com/grandeur-xg-forum/111323-please-help-where-my-thermostat.html

run fault codes to check for failed sensor.

If you are driving in slick conditions on snow and ice or on wet pavement, this could be NORMAL OPERATION. The lights are coming on to let you know that the Traction Control System (TCS) and the Antilock Brake System (ABS) is actively correcting a wheel slip condition.

If this is happening on dry pavement, and you are not driving like a maniac, (making the wheels slip and slide) then there is possibly a problem with one of your wheel speed sensors that is making your TCS and ABS computers "think" that there is a wheel slipping. You will have to scan your computer system and watch the wheel speed sensor data to find out which one is malfunctioning.

Any brand of 5W30 oil is fine. Just buy any decent oil (Castrol, Penzoil, etc.), but not any one labelled "Synthetic".

If you have an after-market cruise control system, you'll need the specs from the company that manufactured it. Otherwise, it's guess work. Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. See if there's a P0500 DTC. I imagine the cruise control system uses this signal as well as the Speedo.
P0500 Vehicle Speed Sensor Malfunction
The vehicile's speed sensor is on the transmission almost directly below the throttle body

It is a three pin connector (pin 1=power-12VDC, pin2=ground, & pin3=signal).

remove back wheels with screendriver adjust handbrake remove rubber plug from disc brake rotate disc brake down and look inside the disc with light;ask other people with ML (mercedes) ,JEEP,GM

I have problem with my hyundai grandeur cd player. I gives me er2 everytime i insert cd. pls help me solve the problem.

Do a tune up and if it's still a problem check your Iac or tps idle air control or throttle position sensor

Hyundai grandeur was running fine and now simply wont start. it turns over fine but thats it?

Hi! have a look at link below:
http://store.payloadz.com/str-asp-i.103789-n.2003_Hyundai_XG_250-300-350_Service_and_Electrical_Manuals_98_63_MB_Other_Files_-end-detail.html