2004 Kia Optima: what breaks, and at what mileage
What breaks on the 2004 Kia Optima
On the 2004 Kia Optima, the failure owners report most often is other body or interior problem, and the reports cluster around 92,500 miles. The earliest to appear is other engine problem, reported by a median of 35,000 miles. Overall it scores 64 out of 100, high risk for a 2004.
High risk for a 2004 — 223rd riskiest of the 329 2004 vehicles we can rate. 306 owner reports; fleet size estimated from this year's own recall paperwork.
What breaks on the 2004 Kia Optima
Owners have reported 46 named failure modes on the 2004 Kia Optima, and the three most-reported carry 49% of everything filed.
Other body or interior problem leads with 90 reports, about 9.9 per 1,000 vehicles and with the middle half of reports between 64k to 120,000 miles.
Door latch or handle failure follows with 37 reports, usually reported between 85k to 120,000 miles.
Other electrical problem follows with 22 reports, usually reported between 45k to 120,000 miles. 3 of those reports mention a fire.
By system, the reports fall mostly into body (133), electrical (31) and airbag (27).
When these failures get reported
251 of the reports on the 2004 Kia Optima came with an odometer reading, and half of those were filed before 80,000 miles.
Cumulatively, 25% by 50,000 miles, 65% by 100,000 miles and 96% by 150,000 miles of the dated reports had been filed.
The busiest stretch is between 80,000 and 90,000 miles, which alone holds 12% of the dated reports.
20% of the dated reports were filed below 36,000 miles.
In the order they tend to show up: other engine problem around 35k, control arm, ball joint or bushing failure around 74k, airbag warning light or occupant sensor fault around 78k and other electrical problem around 87k.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
Showing the 12 most-reported failure modes of 46. The full list is in the table below.
How reports accumulate
Every report with an odometer reading, cumulative, from 0 to 200,000 miles. A curve that climbs early is a car with early problems, whatever its total.
- Line share of reports filed by that mileage
- Dashed the median reported mileage
Severity, and what it costs
Across the named modes, 13 mention a crash, 4 a fire and 8 an injury. Those are the words owners used in their own complaints, and NHTSA does not verify them, but they are the closest thing in this data to a measure of what a failure actually did.
The average severity weight across every report on this year is 3.72, where a stalled engine or a failed airbag weighs many times more than a rattling trim panel, and a figure this high means the reports are dominated by failures with safety consequences rather than annoyances. The weighting is set out in full on the methodology page.
What the top failures cost to put right, as editorial estimates for an independent US shop rather than figures from NHTSA: other body or interior problem at $200–$2,000, door latch or handle failure at $250–$1,200, other electrical problem at $250–$2,000 and airbag warning light or occupant sensor fault at $300–$1,600. Dealer labour, a seized bolt or a part that is no longer made can push any of these past the top of its range.
10% of the reports on this year sit in the engine, transmission, drivetrain or cooling systems — the four where a repair bill is usually four figures.
Every reported failure mode
| Failure mode | System | Reports | With reading | 25th | Median | 75th | Per 1,000 | Typical repair | Severity |
|---|---|---|---|---|---|---|---|---|---|
| Other body or interior problem | body | 90 | 80 | 64k | 93k | 120k | 9.9 | $200–$2,000 | Moderate |
| Door latch or handle failure | body | 37 | 29 | 85k | 101k | 121k | 4.1 | $250–$1,200 | High |
| Other electrical problem | electrical | 22 | 15 | 45k | 87k | 118k | 2.4 | $250–$2,000 | Moderate |
| Airbag warning light or occupant sensor fault | airbag | 19 | 17 | 45k | 78k | 105k | 2.1 | $300–$1,600 | High |
| Control arm, ball joint or bushing failure | suspension | 13 | 11 | 63k | 74k | 95k | 1.4 | $400–$2,200 | High |
| Fuel pump failure | fuel | 8 | 3 | — | 71k | — | 0.9 | $600–$2,600 | High |
| Other engine problem | engine | 8 | 8 | 13k | 35k | 71k | 0.9 | $300–$4,000 | High |
| Timing chain, belt or tensioner failure | engine | 7 | 7 | — | 80 | — | 0.8 | $1,200–$4,500 | Critical |
| Other suspension problem | suspension | 7 | 5 | — | 67k | — | 0.8 | $350–$2,000 | Moderate |
| Rust or structural corrosion | body | 6 | 3 | — | 86k | — | 0.7 | $500–$6,000 | High |
| No-start or intermittent start failure | engine | 5 | 5 | — | 120k | — | 0.5 | $200–$1,800 | Moderate |
| Seat belt or retractor failure | airbag | 5 | 5 | — | 96k | — | 0.5 | $200–$900 | High |
| Fuel leak or fuel odor | fuel | 4 | 4 | — | 3k | — | 0.4 | $300–$2,500 | Critical |
| Ignition switch, key fob or immobilizer failure | electrical | 4 | 4 | — | 113k | — | 0.4 | $250–$1,500 | High |
| Loss of braking | brakes | 4 | 1 | — | 6k | — | 0.4 | $400–$3,000 | Critical |
| Radiator or coolant leak | cooling | 3 | 3 | — | 62k | — | 0.3 | $350–$1,900 | High |
| CV axle or driveshaft failure | drivetrain | 3 | 3 | — | 89k | — | 0.3 | $450–$2,200 | High |
| Premature brake pad or rotor wear | brakes | 3 | 2 | — | 80k | — | 0.3 | $300–$1,400 | Moderate |
| Cruise control failure | adas | 3 | 3 | — | 276 | — | 0.3 | $200–$1,400 | High |
| Other powertrain problem | transmission | 3 | 1 | — | 40k | — | 0.3 | $400–$4,500 | High |
| Other fuel system problem | fuel | 3 | 1 | — | 100k | — | 0.3 | $300–$2,200 | High |
| Other speed control problem | adas | 3 | 3 | — | 51k | — | 0.3 | $250–$2,000 | Critical |
| Alternator or charging system failure | electrical | 2 | 2 | — | 38k | — | 0.2 | $450–$1,600 | High |
| Parking brake failure | brakes | 2 | 2 | — | 142k | — | 0.2 | $250–$1,300 | Moderate |
| Loss of power steering | steering | 2 | 2 | — | 92k | — | 0.2 | $600–$2,800 | Critical |
| Steering rack, gear or tie rod failure | steering | 2 | 2 | — | 4k | — | 0.2 | $700–$2,600 | High |
| Other wheel or tire problem | wheels | 2 | 2 | — | 71k | — | 0.2 | $200–$1,500 | High |
| Other lighting problem | lighting | 2 | 1 | — | 19k | — | 0.2 | $120–$1,200 | Moderate |
| Misfire or rough idle | engine | 1 | 1 | — | 61k | — | 0.1 | $250–$1,600 | Moderate |
| Overheating | cooling | 1 | 1 | — | 7k | — | 0.1 | $400–$3,500 | High |
| Wiring harness or short circuit | electrical | 1 | 0 | — | — | — | 0.1 | $400–$3,500 | High |
| Control module (ECM/PCM/BCM) failure | electrical | 1 | 1 | — | 44k | — | 0.1 | $700–$3,000 | High |
| Engine sensor failure | electrical | 1 | 1 | — | 67k | — | 0.1 | $180–$900 | Moderate |
| Instrument cluster or gauge failure | infotainment | 1 | 1 | — | 64k | — | 0.1 | $350–$1,400 | Moderate |
| ABS module or sensor failure | brakes | 1 | 1 | — | 500 | — | 0.1 | $500–$2,400 | High |
| Airbag failed to deploy in a crash | airbag | 1 | 1 | — | 83k | — | 0.1 | $1,000–$5,000 | Critical |
| Airbag deployed without a crash | airbag | 1 | 1 | — | 15k | — | 0.1 | $2,500–$8,000 | Critical |
| Lane keep or steering assist fault | adas | 1 | 0 | — | — | — | 0.1 | $200–$1,600 | High |
| DPF, EGR or DEF system failure | emissions | 1 | 1 | — | 24k | — | 0.1 | $800–$5,000 | High |
| Headlight failure or clouding | lighting | 1 | 0 | — | — | — | 0.1 | $150–$1,800 | Moderate |
| Wiper or washer failure | glass | 1 | 1 | — | 96k | — | 0.1 | $120–$800 | Moderate |
| Other brake problem | brakes | 1 | 1 | — | 700 | — | 0.1 | $300–$1,800 | High |
| Other steering problem | steering | 1 | 1 | — | 35k | — | 0.1 | $350–$2,400 | High |
| Other seat belt problem | airbag | 1 | 1 | — | 70k | — | 0.1 | $200–$900 | High |
| Other driver assistance problem | adas | 1 | 1 | — | 89k | — | 0.1 | $250–$1,800 | High |
| Other visibility problem | glass | 1 | 1 | — | 10k | — | 0.1 | $150–$1,400 | Moderate |
| Unclassified problem | other | 16 | 12 | 53k | 65k | 100k | 1.8 | — | Moderate |
Rate per 1,000 uses a fleet-size estimate derived from recall paperwork for this exact model year. It is a lower bound. Repair costs are typical independent-shop ranges for the failure, not figures from these reports.
How often, against how many were built
Scaled by an estimate of how many of these cars exist, the 2004 Kia Optima draws about 34 per 1,000 vehicles, which puts it in the 94th percentile of complaint rates among 2004 vehicles we can rate.
That denominator is the weakest number on the page and it is fair to say so plainly. Rate per 1,000 uses a fleet-size estimate derived from recall paperwork for this exact model year. It is a lower bound.
The working figure is 9,134 vehicles. If the true number is twice that, every rate on this page is half what it says; the ranking against other 2004 vehicles, which is what the risk score uses, is far more robust than the rate itself.
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The odometer reading is the one the owner gave.
Other body or interior problem
Tl*the contact owns a 2004 kia optima. The contact stated that when she used the key to unlock the doors, only the rear doors unlocked. The front doors also failed to unlock from inside the vehicle. She had to climb in the vehicle from the backseat. The VIN was unknown. The current mileage was 109,000 and failure mileage was 100,000. The consumer stated the vehicle will not unlock and have been locked out of the vehicle numerous times. The consumer further stated this is a safety issue and had to leave doors unlocked for fear of being locked out of the vehicle. Updated 08/29/07 *tr
Summer of 2007 A/C would not work sporadically. February 1,2008 I had my personal mechanic come to my house to look at my car to figure out why I am hearing noise coming from under my hood. Without any knowledge of my A/C problems he asked me if I have been having problems with my A/C because he sees the problem as being my A/C compressor. Calling around for prices to fix this problem I was informed the kia factory is completely out of A/C compressors. I called my local dealership and they had informed me they have replaced a few A/C compressors recently. My car is not drivable due to quite a few things that will lock up under my hood if I continue driving it. I called kia and was told I have to fix the problem on my own and there is nothing they can do about it. *tr
Door latch or handle failure
The front door lock on our 2004 kia optima will not unlock, you cannot unlock it from inside or outside of the car, and the door will not open; therefore, you must climb to the otherside of the car to exit or climb out through the window, which I believe creates a safety hazard in the event of an accident. Noone would be able to remove you from the car in the event of serious injury, fire or a water rescue. The local kia dealership shop told us that it was a faulty door lock actuator and a common problem, but did not open the door for us. They estimated the cost to repair at $200 plus labor. If this is a common problem, then there should be a recall on this car, especially due to the unsafe nature in the event of an accident. *tr
2004 kia optima (although all models and years are affected) - front door latch defective (research shows both sides affected; this complaint is specific to passenger-side); door will not open. Costly to fix; manufacturer aware of defect. Safety hazard; in the event accident involving drivers' side, no way to exit vehicle; would inhibit successful rescue attempts. There is no reason for the consumer to have to shoulder the cost of repair due to poor quality parts or workmanship. This is not only a safety issue, but also a widespread defect, as evidenced by numerous internet blogs on this subject, and dealer acknowledgment. *tr
Other electrical problem
Tl*the contact owns a 2004 kia optima. In june of 2004, the exterior lighting failed while driving at an unknown speed. In addition, the driver's side door would not lock and the check engine light consistently illuminated. The contact took the vehicle to the dealer and the exterior lighting was repaired; however, the door was not because it was not under warranty. After the repair was made, the exterior lighting continued to fail as well as the other issues. She took the vehicle back to the dealer approximately four times to repair the same failures, but the issues kept persisting. The vehicle has not been repaired since. The current mileage was 93,000 and failure mileage was 19,195. Updated 10/05/08 *cn the headlights and brake lights were replaced several times. The dimmre switch also failed. Updated 11/06/08. *jb
My car doors do not open either inside or outside. This problem started with my front passenger side door and now is affecting my drivers side door. The problem appears to be electrical and will happens randomly. The pass. Door is now 100% affected and the drivers side just started today. So the end result is I am locked inside my car unless I crawl through the window. I googled this problem online and apparently this problem is rampant. I called kia customer service and they said that there is not a recall and because my car is a 2004 (with only 39,000 miles) they will not cover it. I told him how dangerous this type of problem was and he really didnt seem to care. Ii asked him who issues recalls and he said it was your organization, when I said that I would call you to try and get a recall he then said "well you could bring it into kia and see what they find, although no gaurantee I would get it paid for by them even though it has happened to many kia cars. I then told him I would be contacting your organization and he didnt seem to happy. * when my passenger door started with this problem approx. 2 months ago I called the local…
Recalls on the 2004 model year
NHTSA has issued 1 recall campaign covering the 2004 Kia Optima, affecting an estimated 9,134 vehicles. A recall is a different kind of evidence from a complaint: it is the regulator and the manufacturer agreeing that something has to be fixed, and the fix is free for as long as the car exists.
The campaigns cover suspension:front. Whether the work was actually done on the car in front of you is a question only the VIN can answer, and the manufacturer or NHTSA will answer it free.
Recalls also distort complaint counts. Publicity about a campaign reminds owners that complaining is possible, so reports for a recalled component often spike after the recall rather than before it.
SUSPENSION:FRONT
36,538 vehicles 2009-05-27- Defect
- Kia motors corporation (kmc) is recalling 36,538 model year 2001-2004 optima vehicles originally sold in or currently registered in the states of connecticut, delaware, illinois, indiana, iowa, maine, maryland, massachusetts, michigan, minnesota, missouri, new hampshire, new jersey, new york, ohio, pennsylvania, rhode island, vermont, west virginia, wisconsin, and the district of columbia. Road salt applied in these states during the winter months may result in progressive, internal corrosion of the front subframe. Over time, such subframe corrosion near the connection to…
- Consequence
- Corrosion of the front subframe could lead to separation, possibly resulting in a vehicle crash.
- Remedy
- Kmc will notify owners and dealers will repair the vehicles free of charge. The safety recall began on june 15, 2009. Owners may contact kia's consumer assistance center at 1-800-333-4542.
Recall work is free at a franchised dealer regardless of the car's age. Check the VIN at nhtsa.gov/recalls before assuming it was done.
How it ranks in the 2004 field
The score at the top of the page, placed among its peers. The zones are the same thresholds the scorer applies, read out of the scorer itself, so the picture and the band word cannot disagree.
Scores are ranked within the model year, never across years, because an older car has had longer to accumulate reports.
- Left fewer and less serious reports
- Right more, or worse
- Marker this vehicle
Better and worse years of the same car
High risk for a 2004 — 223rd riskiest of the 329 2004 vehicles we can rate. Every score on this site is a rank inside its own model year, which is what makes a 2004 and a 2019 comparable at all.
Across the 20 model years of this car that carry enough reports to score, 2005 comes out best at 57 and 2019 worst at 80, with 2004 itself at 64.
If the model year is negotiable, 2005 scores lower than 2004 by a margin worth acting on. Same body, same engines, different luck — usually a supplier change or a mid-cycle fix, which the complaint data can show but never explain.
Within the 2001–2004 generation specifically, 2003 is the strongest year at 62 and 2001 the weakest at 70.
Scores compare each year against other cars of the same model year, so a low number on an older car is a real result and not an artefact of age.
Shorter is better. Years with too few reports to score are shown without a bar rather than as a zero, because no data is not good news.
Within the 2001-2004 generation, 2003 Kia Optima scores best at 62 and 2001 Kia Optima worst at 70.
What the numbers say to check
The mileages below are where the first quarter of reports for each mode had already been filed, which makes them the point at which a fault is worth looking for rather than the point at which it happens: other engine problem from about 13k, other electrical problem from about 45k, airbag warning light or occupant sensor fault from about 45k and control arm, ball joint or bushing failure from about 63k.
On a 2004 Kia Optima with more miles than that on it, the useful question to put to a seller or a mechanic is whether other engine problem has been dealt with, and if so with what parts and at whose expense. A car that has already had the repair is in a different position from one that has not.
None of this is a diagnosis. It is a list of what other owners of the same model year reported, ordered by when they reported it, which is a good place to point an inspection and a poor place to stop.
Where these figures stop being useful
306 owner reports; fleet size estimated from this year's own recall paperwork. Every count on this page is therefore a floor: it is the number of owners who went to the trouble of filing with a federal agency, which is a small and self-selected fraction of the owners who had the fault.
Of those 306 reports, 251 carried an odometer reading, so the mileages here describe 82% of the sample rather than all of it. Owners also round: readings pile up on multiples of ten thousand, which is why this site publishes "about 90,000 miles" and not "91,438".
Named failure modes come from matching phrases in the complaint text, so a badly worded complaint can land in the wrong bucket. The effect washes out across hundreds of reports and does not wash out across five.
And nothing here predicts what one car will do. These are other people's complaints, filed years apart, on cars maintained by strangers. Read the page as a map of where this model year has previously gone wrong, then have the specific car in front of you inspected.
Questions this page answers
What are the most common problems with the 2004 Kia Optima?
The most-reported failures are other body or interior problem (90 reports, median 92,500 miles), door latch or handle failure (37 reports, median 100,000 miles) and other electrical problem (22 reports, median 85,000 miles). Counts come from owner complaints filed with NHTSA, which are voluntary, so they show what owners bothered to report rather than every fault that occurred.
At what mileage do 2004 Kia Optima problems start?
Other engine problem is the earliest failure mode to show up, with a median reported mileage of 35,000 miles and a quarter of reports before 15,000 miles. Across all failure modes on this year, the median report sits at 80,000 miles.
Is the 2004 Kia Optima reliable?
It scores 64 out of 100 on our risk index, which is high — 223rd riskiest of the 329 2004 vehicles we can rate. The score is a comparison against other 2004 vehicles, not a prediction about any individual car, and it is built from complaint rates, severity and how early failures appear.
Which year of the Kia Optima is best?
Within the 2001–2004 generation, 2003 scores best at 62 out of 100 and 2001 worst at 70. Same body, same engines, different luck.
Where this comes from. Every figure above is computed from NHTSA owner complaints and recall records for this exact make, model and year. Complaints are voluntary and self-selected, so treat counts as a floor. The methodology page writes out each formula, and the same numbers are available as JSON.
What breaks at my mileage Compare with another car
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed