2004 Kia Optima Problems

What owners report

Owners of this model year most often report a driver-side door that will not unlock or open from either inside or outside, and airbag warning lights that come on and stay on. Subframe and front suspension corrosion or separation, often linked in complaints to a regional recall, also appears in the sample, usually on higher-mileage cars. Complaints arrive across a wide mileage range, from under 20,000 miles to well past 150,000.

1. 1
   Latches, locks and linkages

   Driver-side door will not unlock or open

   • 125 complaints (56%)
   • median 95,000 mi at 8.5 yrs old (107 state mileage)
   • 2 mention a crash, fire or injury
   • owner-quoted repair $300 (median of 5 quotes)
   • filed 2007–2022

   Complaints describe the driver's door refusing to unlock or open using the key, the keyless remote, the power lock switch, or the inside handle. Several owners report the locks cycling unlock-relock, or having to enter and exit through the passenger side. Some say a dealer diagnosed a failed door latch or lock actuator and that repairs were not covered by warranty, and in some cases the failure returned after replacement. Reported from about 19,000 to 145,000 miles, with many between roughly 60,000 and 110,000 miles.

   1 related service bulletin

   What to check: Try the driver's door repeatedly with the key, the remote, and the inside handle before buying, and ask whether the door latch or actuator has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “Out of nowhere my daughter's car door would not open, trapping her inside. It won't open with the key or remote. I called Kia and they said my warranty ran out and there is no recall despite this being a common issue-- a very dangerous safety issue I must say, since the driver and passengers could possibly be trapped and die in an emergency.”

   NHTSA complaint #10807653, filed 2015-12, 64,200 miles

   “I went to unlock my 2004 Kia Optima and the drivers door would not unlock. Repeated attempts failed. I have read numerous forums and this is a recurring problem with this car! This is a safety issue and the car is only 10 years old! If an accident occurs, I would not be able to be rescued. Kia needs to address this problem.”

   NHTSA complaint #10629344, filed 2014-08, 111,715 miles
2. 2
   Air bags

   Airbag warning light stays on

   • 20 complaints (9%)
   • median 54,000 mi at 6.8 yrs old (18 state mileage)
   • 1 mention a crash, fire or injury
   • filed 2005–2016

   Owners report the airbag warning light illuminating and staying on, sometimes intermittently, with no crash involved. Complaints mention dealer diagnoses of a switch, connector, clock spring, or wiring harness, and some describe repeated repairs. One owner reported airbags not deploying in a front impact. Reported from about 12,000 to 80,000 miles, often on cars several years old.

   1 related service bulletin

   What to check: Check that the airbag light comes on at startup and then goes out; if it stays lit, ask for the stored airbag codes and any repair history.

   2 excerpts from owner complaints in NHTSA records

   “Me 2004 Kia have the air bags light on and I have take the vehicle to a repair shop and they had not find what is wrong with it. I call the Kia dealer and I was told that there was nothing they could do. I am afraid the air bags will pop while I am driving. Can you please tell me if this is a safety issue. The air bags light stay on at all time. Thank you”

   NHTSA complaint #10294558, filed 2009-12, 100,169 miles

   “The air bag light illuminates on the cluster panel, the code shows that there is high resistance in the driver seat air bag. This issue was fixed while vehicle was under warranty but continues to show up. I was told I can replace the seat and it would correct the issue but I picked one up at a junk yard that had the same issue.”

   NHTSA complaint #10547472, filed 2013-10, 20,000 miles
3. 3
   Body and structure

   Subframe or front suspension corrosion and separation

   • 22 complaints (10%)
   • median 71,284 mi at 9.3 yrs old (18 state mileage)
   • 2 mention a crash, fire or injury
   • filed 2005–2025

   Complaints describe rusted or fractured subframe sections, a frame separating from the body, and front lower ball joint or axle separation, sometimes with the wheel coming loose. Owners report poor handling and tire wear, and several say they were told their vehicle was not covered by the front suspension recall. Mostly reported from about 68,000 to 178,000 miles, often on older cars in rust-prone areas.

   Recall 09V1830001 related service bulletin

   What to check: Have the subframe and front suspension inspected for rust and cracks on a lift, and check whether the vehicle was covered by and serviced under the front suspension recall.

   2 excerpts from owner complaints in NHTSA records

   “The passenger wheel came off the car as my son was backing out of a parking space at a grocery store. I bought this car new. That part of the car had never been worked on. The car had to be towed to a garage for repair. Kia used glue on life a support nut on a ball joint, where they should have used a cotter pin. I have bought four (4) kias. These cars are still in the family. The Kia I drive daily is identical (except being automatic) to the one that the wheel came off.”

   NHTSA complaint #10534657, filed 2013-08, 102,800 miles

   “Sub frame rot leading to poor handling , tire wear, bad engine performance. The rotted supframe is separating from body, causing poor performance. The car is performing poorly at all speeds. Not safe...”

   NHTSA complaint #10785782, filed 2015-10, 124,000 miles
4. 4
   Electrical system

   Stalling or loss of power while driving

   • 32 complaints (14%)
   • median 71,000 mi at 7.4 yrs old (25 state mileage)
   • 4 mention a crash, fire or injury
   • filed 2004–2022

   Owners describe the engine shutting off or power dropping out while driving, sometimes at highway speed, with the car restarting after sitting. Complaints mention dealer diagnoses of a crankshaft position sensor or alternator, and one describes a burned fuel pump connector inside the tank. Reported from about 29,000 to 120,000 miles.

   1 related service bulletin

   What to check: Ask whether the crankshaft position sensor has been replaced, and have the charging system and fuel pump checked during a pre-purchase inspection.

   2 excerpts from owner complaints in NHTSA records

   “The car was running fine until after a few hours of driving it just stopped running. This is the second time this has occurred. The engine RPM dropped to zero and the car coasted. After sitting for less than an hour the car started up again. I took it to the Kia dealer and they said, even though the car had less than 60,000 miles, they would have to diagnose the problem and charge us $200 to do so, and the electronic parts were not covered.”

   NHTSA complaint #10470101, filed 2012-08, 51,000 miles

   “Dt: while driving on the road at 75 MPH vehicle stalled. The engine shut down. Also, electrical system shut down. Vehicle was pulled over to the curve. Then owner called dealership who was suppose to pick up vehicle up but didn't show up for about 4.5 hours. The vehicle was towed to a garage, and was left at the shop. The next day owner called to check on the vehicle, nothing was done . The mechanic said it was the alternator. Currently, the owner was waiting for the alternator. …”

   NHTSA complaint #10130335, filed 2005-07, 29,000 miles

Buying note. On this model year, open and close the driver's door several times and check the airbag light before anything else, and have the underside inspected for subframe rust. Ask for service records covering door latch, sensor, and recall work.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.