Is the 2004 Kia Optima a bad year?
225 owner complaints to NHTSA. Engine and transmission complaints are in line with other Optima years.
Keep it
Engine and transmission complaints for the 2004 Kia Optima are in line with other Optima years. Latches and locks, electrical system and body structure stand out for this year: see below.
The verdict moves with mileage: the same car reads differently at 30,000 and at 150,000 miles.
What 2004 Optima owners report, by mileage
Each system owners named in five or more complaints, with the mileage range where the middle half of those complaints were filed. Read at 94,000 miles.
| SYSTEM | COMPLAINTS | MIDDLE HALF FILED AT | TYPICAL US REPAIR BILLS |
|---|---|---|---|
| Latches and locksSTANDS OUT | 81 (36%) | 70k–120k miles · around this mileage | — |
| Electrical systemSTANDS OUT | 45 (20%) | 53k–120k miles · around this mileage | 12-volt battery replacement $100–$400 · Starter motor replacement $350–$1,200 |
| Body structureSTANDS OUT | 42 (19%) | 70k–121k miles · around this mileage | — |
| Air bags | 26 (12%) | 41k–95k miles · around this mileage | — |
| Suspension | 19 (8%) | 68k–114k miles · around this mileage | Ball joint replacement (one joint) $200–$500 · Control arm replacement (one arm) $200–$900 |
| Fuel system | 10 (4%) | 62k–99k miles · around this mileage | Fuel pump replacement $220–$1,500 · Fuel injector replacement (one injector) $300–$1,200 |
| Engine | 13 (6%) | 21k–70k miles · mostly behind | — |
| Transmission and drivetrain | 8 (4%) | too few with a mileage | — |
| Brakes | 7 (3%) | too few with a mileage | — |
| Steering | 7 (3%) | too few with a mileage | — |
| Seat belts | 6 (3%) | too few with a mileage | — |
| Exterior lighting | 5 (2%) | too few with a mileage | — |
| Speed control | 5 (2%) | too few with a mileage | — |
Bills are typical US ranges from the sources named in the tool (J.D. Power, Kelley Blue Book, CarParts.com and others), printed only for systems that stand out or sit at or ahead of 94,000 miles. Not a quote.
What owners reported alongside their complaints
Of 225 complaints: 8 mention a crash · 3 mention a fire · 7 report an injury · 2 say the car was towed.
No complaints in the last 12 months; the newest was filed in Feb 2025.
Counts of what owners wrote in their complaints, not verified by anyone.
Recalls for the 2004 Kia Optima: 1
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 the lower control arm can lead to wheel misalignment and/or other noticeable stress in steering, or accelerated abnormal tire wear. Corrosion of the front subframe could lead to separation, possibly resulting in a vehicle crash.
A recall may cover only some cars of a model year; the campaign size counts every model and year it lists. Enter your VIN at nhtsa.gov/recalls: dealers fix open recalls free.
Service bulletins from Kia: 8
Repair instructions Kia sent its dealers for symptoms seen in the shop on the 2004 Kia Optima. Ask a dealer or mechanic for a bulletin by its number.
ENGINE COMPONENT RE-USE GUIDELINES - In general, parts and components removed during engine repairs should be considered serviceable…
Intermittent MIL on with no fault code stored; information about DTC P1330
ECM upgrade with tp sensor replacement-mil on with DTC P2135/P0638
Neighbouring years
2003 Optima: 141 complaints, keep it · 2005 Optima: 144 complaints, keep it.
Every Kia Optima year
2001 · 2002 · 2003 · 2004 · 2005 · 2006 · 2007 · 2008 · 2009 · 2010 · 2011 · 2012 · 2013 · 2014 · 2015 · 2016 · 2017 · 2018 · 2019 · 2020 · All Optima years side by side
Other Kia models: Kia Amanti · Kia Cadenza · Kia Carnival · Kia EV6 · Kia EV9 · Kia Forte · Kia K5 · Kia Niro · Kia Optima Hybrid · Kia Rio · Kia Rondo · Kia Sedona · Kia Seltos · Kia Sephia · Kia Sorento · Kia Soul · Kia Spectra · Kia Sportage · Kia Stinger · Kia Telluride. All makes and models.
Questions
Is the 2004 Kia Optima a bad year?
225 owner complaints to NHTSA. Engine and transmission complaints are in line with other Optima years. At 94,000 miles the tool says: Keep it.
What are the most common problems with the 2004 Kia Optima?
By owner complaints to NHTSA: latches and locks (81), electrical system (45), body structure (42), air bags (26), suspension (19).
How many recalls does the 2004 Kia Optima have?
1 recall campaign list this model year: Suspension (NHTSA 09V-183). A recall may cover only some cars; check by VIN at nhtsa.gov/recalls.
Method: counts of unverified owner complaints filed with NHTSA, compared only with other years of the same model (sales volumes are unknown, so no failure rate is computed). A system stands out at 40+ complaints and at least twice the model's quiet (lower-quartile) year, or twice the share across every vehicle of that model year. The mileage range is the 25th to 75th percentile of the mileages owners reported. Data received by NHTSA through November 5, 2026. Repair prices are typical US ranges from named sources, not quotes. Not a diagnosis and not financial advice. PulsCar is not affiliated with NHTSA. Check this car at your own mileage.