Hi, I have a 2005 Sonata. I lock the doors with the remote, but after about 5 minutes they all unlock again by themselves, the doors can be opened and the alarm will sound until i use the remote to turn the alarm off. the Dealer had a look while it was under warranty but couldn't find out why it was happening. Hope you can help. Thanks

SOURCE: Door locks don't work

Disassemble the paneling on left side ,under the steering wheel. Remove all screws and pull out the panel until you can you can reach behind it to remove the two Black Relays, on the side closest to Steering wheel. Remove the Relay covers, Clean the contacts with a 1/8 fine strip of 600 wet/dry sand paper. Only place the paper between the contacts, and pull out while holding slight pressure on the relay Armature. Turn over the sandpaper and repeat once again. Very gently press the TOP resting contact pad closer to the armature, to lessen the gap between the contact points, so the armature doesn't have to travel as far to reach the closed contact position. Repeat the above with the other2nd Relay. Replace the covers, reinstall the relays And test the Door locks prior to buttoning up the paneling. Note, a pair of long needle nosed pliers will help in removing the relays. Just Grip the relay and rock in Forward and Backward as you apply upward pressure.

SOURCE: HOW MUCH TO PAY FOR TIMING BELT CHANGE-HYUNDAI SONATA 2002

Hi if your made of money then you can go to the main dealer but if your local mechanic is reputable then he should be alot cheaper for the same job, also the timing belt is not usually covered under warrenty, but to comply with the warranty you must keep your car serviced and replacing the timing belt is part of a main service, Hope this helps

SOURCE: paint peeling on my used 2002 sonata

the dealer won't help you without getting paid. unfortunately, no one will. if you need to fix the paint, take it to a paint or body shop. it will cost you though.
if you're into doing it yourself, and it's not peeling in a big area, you can get some touch up paint that matches and try it yourself. i don't reccomend this for any area bigger than two hands though, it takes practice to look right.

the problem is sometimes hyundai's bonding agent (chemicals that stick the paint to the surface) doesn't work as well as it should. most bonds are harder on plastic, hyundai cars have trouble keeping their paint on the door handles, too.

SOURCE: 2006 Hyundai Sonata brake switche

hyundai bumper to bumper warranty is 5yrs 60k miles with 100k powertrain for original owner. unless you have an extended warranty it is not covered. there is actually a tsb for adjustment on the brake lamp switch

SOURCE: 2003 Hyundai Sonata Door Lock Problem

I had this problem. Through some research and asking some service personnel I found out it is a fairly easy fix. You will need to buy a new relay switch for the door locks. The dealer will/should know what you need. They are located (two of them, buy two and replace both) on the back side of the fuse box. It is not that easy to get back there. I had to lay on my back with my head up under the instrument panel. They are visible and can be removed if you take some time and be careful. Once I knew what I was looking at, it was easy to replace and the remote works like a charm. You can go to an auto supply, like Autozone, and they should have a schematic to show you where these relays are.