Which parts fail
Components named in complaints (front, side and curtain air bags, sensors and inflators).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 1999 Kia Sephia owners, lightly cleaned up (personal details are redacted by NHTSA).
This car has been a constant repair and financial problem for the last 4 years starting two weeks after I purchased the car. It is an unsafe vehicle and can not be kept maintained for safety or reliability it was purchased with 21000 miles on the vehicle and a majority of repairs has had to be fixed. 4 starters, ignition switch, ignition switch wiring harness (ignition still doesn't work), air bag sensor, air bag wiring (air bags still does not work), alternator, front passenger side drive axel broke while I was driving the car, right passenger ball joint fell off the car while I was driving the car, master cylinder and rear brake cylinder went out at the same time while I was driving the car, heater/air conditioning motor. The car has been towed 3 times, and has left me and my children stranded too many times to count. The car is still in need of major repair. …
Dt*: the contact stated while driving the vehicle 45mph another vehicle rear ended the contact's vehicle. This resulted in a collision, the air bags did not deploy. Also the driver's seat fell backward during the collision. Injuries were sustained; the vehicle was able to be driven home. The vehicle has not been inspected. The manufacturer has not been contacted , no repairs made.
The horn stopped working on my 1999 Kia Sephia with 61,000 miles. The dealership (which also sells and services fords) estimated the repair at $50 to $100, which I authorized. A few hours later the service manager called and told me to forget it. Due to a totally bizarre design, the horn is integrated into the airbag unit and fixing the horn requires replacing the entire airbag assembly. The cost: $650 for the part and $150 labor, total $800. If the horn design were normal, he said it would have cost less than $100. I called Kia of America consumer affairs and offered to pay $100, the normal amount, toward the repair. They declined as the car is out of warranty and said that I would have to pay the full cost myself. I had placed the car on sale just before the horn went bad and have been unable to sell it as nobody wants to buy a car without a horn. …
While driving on the beltway consumer attempted to stop vehicle on heavy traffic but the brakes failed to stop. The consumer pressed on the pedal and the pedal hit the floor without stopping. The consumer served to the side to slow the vehicle down and coast. The consumer had the brakes already replaced at 9,000. Also, brake failure caused consumer into an automobile accident. Airbags did not deploy at the time of the accident. Per dealer, manufacturer is aware of brake problem.
When consumer's vehicle crashed into the passenger's side of another vehicle, there was no deployment of the driver's side or passenger's side air bags. Vehicle was traveling about 10-15 MPH when crash happened. Vehicle has been repaired. Also, brake rotors have been replaced twice , once at 3,000 miles, and again at 6,000 or 7,000 miles. However, brake rotors need to be replaced again.
Consumer was traveling 35mph and another vehicle crashed into wheel well on passenger's right side. Upon impact, airbags didn't deploy. Dealer suggested that onsumer call NHTSA. They didn't offer to inspect vehicle. Consumer was contacting manufacturer to insist that they inspect vehicle.
While driving 65 MPH consumer was involved in a frontal collision. Upon impact, both frontal air bags failed to deploy. This caused driver to sustain minor injuries, and was transported to a hospital by ambulance. The vehicle was towed to the dealer for inspection.
While driving on road, traveling 55mph and up, ahead there was an accident. The vehicle in front stopped to look at the accident that already accurred. Driver wasn't paying attention and rear ended vehicle in front. Driver's side airbag didn't deploy.
Airbags failed to deploy even though the listed auto struck seven other vehickle's, rolled and landed on it's side. The auto was totalled and the driver was hopitalized. A copy of the accident report can be provided upon request.
Brakes went out after being applied. Was traveling 30mph & was trying to stop. Brake pedal went to the floor. Rearended another vehicle in front. Upon umpact, air bags failed to deploy. Vehicle was towed home.
Airbag complaints in other Sephia years
Frequently asked questions
How common are airbag problems on the 1999 Kia Sephia?
NHTSA has 37 complaints about the air bags of the 1999 Kia Sephia, 9% of the model year's 428 complaints. The component named most often is frontal (25 mentions).
Is there a recall for 1999 Kia Sephia airbag problems?
No. NHTSA lists no air bags recall for the 1999 Kia Sephia, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 1999 Kia Sephia airbag problems start?
Half of the complaints with a recorded mileage happened before about 69,000 miles, and 17% before 25,000 miles.
Is it dangerous?
Owners linked 30 crashes, 1 fire and 27 injuries to air bags problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.