My 2006 Sonata V6 started sounding like a diesel when started after sitting for several hours. This clattering sound continues for 4-5 miles before subsiding. This started when the car had approx. 25,000 mi. I have had it in two different dealers for a total of 6 times. They changed the timing belt tensioner a couple of times, changed an ac reed valve, and last time replaced the valve lifters, which they said were badly worn. None of these efforts fixed the problem. It continues to get worse. I am taking it in again this week for try #7.

- Sanford, FL, USA

S10 appropriate handling re defective engine-malfunction indicator light and erratic RPM reading involving reduce acceleration fm owner of a 2006 Hyundai Sonata LX. The consumer stated the check engine light illuminated. The vehicle was taken to the dealership several times, only to be told there was nothing wrong. The tail lights burned out, the passenger side air bag light illuminated when the passenger seat was occupied, the ESC light would blink while driving in the rain and due to the ESC light being on, the vehicle would become un-drivable.

- York, SC, USA

The contact owns a 2006 Hyundai Sonata. While driving 70 mph the engine and ESC light illuminated on the instrument control panel, and then the engine stalled. The vehicle was taken to the dealership for inspection. The technician from the dealer stated that the throttle position switch and the ECU software needed to be replaced. The current and failure mileages were 75000.

- Fairborn, OH, USA

Occurred three days since purchase of new 2006 Hyundai Sonata 4-cylinder 4-door sedan. First occurrence was in summer of 2006. Second occurrence was in Jan 2007 and most recent occurrence is on Jan 28, 2008. Problem occurred after car has been driving on highway for at least 30 minutes and coming to a stop before traffic light upon exiting highway ramp. Car stalled with battery and oil lights on and no power.

- Etobicoke, 00, USA

This complaint applies to a 2007 Hyundai Sonata limited (no option for 2007 was available in drop down menu) (issue 1) at or around the initial few days after taking delivery I began to notice abrupt vibration and shaking coming from the steering wheel; substantial enough to feel in the seat. Vehicle was taken back to dealership on 3 separate occasions to remedy the problem but they reported that they were unable to duplicate the problem and reported the vehicle to be in manufacturer specification. Nonetheless, dealer attempted wheel balance and radial force balance as a "good will gesture." Problem is now more articulated and the issue remains unresolved. (issue 2) engine emits a rattle noise similar to lifter clatter upon start and continues throughout operation; particularly in colder weather. Timing chain tensioner was replaced and one noise was resolved but the continual nature of the lifter clatter remains. Dealership and Hyundai representative reported that they were unable to duplicate the problem and the issue remains unresolved. (issue 3) fuel sloshing coming from the fuel tank. Manufacturer and dealer claims this to be normal and not a safety risk. Sound is more pronounced at or around 3/4 tank. Brought this to the attention of the dealer and the manufacturer directly and remains unresolved.

- North Brunswick, NJ, USA

A fire started in the engine of my two-month-old 2006 Hyundai Sonata after it had been parked for approximately five hours. On the night that this happened, I had driven my Sonata three hours from atlanta, ga to albany, ga and parked in my driveway at about 5:30pm. I subsequently ran a local errand and parked my car for the evening at 7:30pm. The car was parked about 2.5-3 feet behind my mother's 1994 Chevrolet Corsica. Around 12:30 midnight, my next door neighbor was banging on my window, yelling, "you have to get out of the house, your car is on fire!" flames shot up 5-6 feet in the air and ignited the trunk of my mother's car. Trees nearby were singed, and melted metal and rubber damaged the driveway. Thanks to my neighbor's quick action, the flames did not reach the fuel tank of my mother's car or our house, thereby averting a real disaster. The fire department extinguished the fire and determined that the fire started in the engine. It became clear that the local service center, manufacturer and insurance company were not the parties responsible for conducting the investigation into the exact cause of the fire. Wider consumer awareness of the NHTSA and the complaint-to-recall process will enhance safety by encouraging all parties to take appropriate action and responsibility.

- Albany, GA, USA