Problems · NHTSA complaints
2004 Kia Optima problems
Owners filed 225 complaints about the 2004 Kia Optima with NHTSA between Dec 2003 and Feb 2025. The most-cited component is latches/locks/linkages (81).
Complaints
225
Filed with NHTSA
Crashes
8
Reported by owners
Fires
3
Reported by owners
Injuries
8
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Latches/locks/linkages81
- Electrical system45
- Structure42
- Air bags26
- Suspension19
- Engine and engine cooling11
- Fuel system, gasoline9
- Power train8
- Steering7
- Seat belts6
- Vehicle speed control5
- Exterior lighting5
- Service brakes, hydraulic5
- Wheels4
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Oct 28, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
1
6
9
5
8
15
9
30
28
20
18
20
29
12
8
2
1
0
1
2
0
0
1
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2003 | 1 |
| 2004 | 6 |
| 2005 | 9 |
| 2006 | 5 |
| 2007 | 8 |
| 2008 | 15 |
| 2009 | 9 |
| 2010 | 30 |
| 2011 | 28 |
| 2012 | 20 |
| 2013 | 18 |
| 2014 | 20 |
| 2015 | 29 |
| 2016 | 12 |
| 2017 | 8 |
| 2018 | 2 |
| 2019 | 1 |
| 2020 | 0 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 1 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Latches/locks/linkages
81 reports
“TL* THE CONTACT OWNS A 2004 KIA OPTIMA. THE CONTACT STATED THAT THE DRIVER'S SIDE DOOR FAILED TO UNLOCK. THE CONTACT WAS ABLE TO GAIN ACCESS AFTER SEVERAL ATTEMPTS. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 101,000.”
Electrical system
45 reports2 crashes3 fires
“ON SEVERAL OCCASIONS, WHEN MANUALLY UNLOCKING THE POWER DOOR LOCKS, THEY WILL IMMEDIATELY LOCK AGAIN AND WILL GO INTO A LOOP OF UNLOCK-RELOCK, WHETHER USING THE MANUAL DOOR LOCK OR THE POWER LOCK SWITCH (THE RELAY CLICKS BUT NOTHING HAPPENS WHEN USING THE SWITCH). THIS HAPPENS ABOUT 10% OF THE TIME.”
Structure
42 reports1 crash
“Door lock/unlock mechanism has failed. Unable to unlock and open door from outside or inside. This defect causes the door to stay locked and unable to open. This can trap people inside of the car if they are unable to crawl out a window or exit from another door. There are many reports of this on Kia forums and general Google search. There was no warning that this part was wearing out until it became impossible to open the door.”
Air bags
26 reports3 crashes
“TL* THE CONTACT OWNED A 2004 KIA OPTIMA. WHILE DRIVING 25 MPH, ANOTHER VEHICLE CRASHED INTO THE CONTACT'S VEHICLE FROM THE FRONT. THE PASSENGER SIDE AIR BAGS FAILED TO DEPLOY. A POLICE REPORT WAS FILED. THE CONTACT SUSTAINED STOMACH AND CHEST INJURIES THAT REQUIRED MEDICAL ATTENTION. THE VEHICLE WAS NOT TAKEN TO THE DEALER. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE VEHICLE WAS DESTROYED. THE MANUFACTURER WAS NOT CONTACTED. THE VIN WAS UNKNOWN. THE APPROXIMATE FAILURE MILEAGE WAS 57,000.”
Suspension
19 reports1 crash1 related recall
“Had some noise coming from the front of the car, had my mechanic look at it, he said we needed a control arm. When he took off the cover to replace the control arm, he found the sub frame had rotten and was cracking. As I looked online, I saw that KIA had a recall for this issue. When I contacted KIA, their response was "as my car is not under warranty, they are not required to repair the car" The car in question has 70, 558 miles on it. We are the 2nd owner.”
Engine and engine cooling
11 reports
“TL* THE CONTACT OWNS A 2004 KIA OPTIMA. THE CONTACT WAS DRIVING 35 MPH WHEN THE VEHICLE LOST POWER. THE CONTACT WAS ABLE TO DRIVE THE VEHICLE TO THE DEALER FOR DIAGNOSTIC TESTING AFTER RECEIVING A JUMP START TO THE BATTERY. THE DEALER CONFIRMED THAT THE CRANK SHAFT SENSOR NEEDED TO BE REPLACED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE VEHICLE WAS REPAIRED. THE FAILURE AND CURRENT MILEAGES WAS 80,034.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 28, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.