Is the 2018 Kia Optima a bad year?
233 owner complaints to NHTSA. Engine complaints: 144, 11× a quiet Optima year.
Consider selling
Half of all engine complaints about the 2018 Kia Optima were filed between 24k and 102k miles. You're at 71,000 miles.
The verdict moves with mileage: the same car reads differently at 30,000 and at 150,000 miles.
What 2018 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 71,000 miles.
| SYSTEM | COMPLAINTS | MIDDLE HALF FILED AT | TYPICAL US REPAIR BILLS |
|---|---|---|---|
| EngineSTANDS OUT | 144 (62%) | 24k–102k miles · around this mileage | Valve cover gasket replacement $110–$500 · Timing chain replacement $1,000–$4,000 |
| Electrical system | 33 (14%) | 13k–45k miles · mostly behind | — |
| Transmission and drivetrain | 19 (8%) | too few with a mileage | — |
| Brakes | 17 (7%) | too few with a mileage | — |
| Exterior lighting | 14 (6%) | too few with a mileage | — |
| Fuel system | 13 (6%) | too few with a mileage | — |
| Steering | 12 (5%) | too few with a mileage | — |
| Speed control | 10 (4%) | too few with a mileage | — |
| Air bags | 9 (4%) | too few with a mileage | — |
| Body structure | 7 (3%) | too few with a mileage | — |
| Seat belts | 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 71,000 miles. Not a quote.
What owners reported alongside their complaints
Of 233 complaints: 10 mention a crash · 10 mention a fire · 7 report an injury · 19 say the car was towed.
27 complaints were filed in the last 12 months, the newest in Oct 2026.
Counts of what owners wrote in their complaints, not verified by anyone.
In owners' own words
High injector fuel pump top engine mount went out at 68000 miles. It caused the vehicle to stall and lose power and basically cut the car off while driving.
I originally leased my 2018 Optima with 98 miles on it and bought it out at the end of my lease this was my second Optima, I also had 2 Hyundai sonatas.
When I got in my car the check engine can on. I started driving my car to work, because I was not sure why this light came on because this was/is a new car.
Unedited excerpts from complaints filed with NHTSA, chosen by mileage (nearest 71,000 miles), not by content. Unverified.
Recalls for the 2018 Kia Optima: 2
The trunk latch base may crack, preventing the opening of the trunk from the inside. A person inside the trunk compartment may become trapped, increasing their risk of injury.
These vehicles are equipped with a Voltage Protection Device (VPD), designed to protect the high voltage battery module, that may activate inadvertently. If the VPD activates while the vehicle is being operated in Electric Vehicle (EV) mode, there may be a loss of power, increasing the risk of a 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: 87
Repair instructions Kia sent its dealers for symptoms seen in the shop on the 2018 Kia Optima. Ask a dealer or mechanic for a bulletin by its number.
Product improvement campaign: engine replacement instructions for DTC P1326 (PI1802Y/Z)
SC205_stkr: voluntary emissions service campaign completion sticker
Voluntary emissions service campaign: theta 2.0L t-gdi ulev logic improvement for emissions (SC205)
Injector harness routing for PI1802Y/Z and PI1803Y/Z engine replacements
NHTSA defect investigations: 2
Loss of Motive Power
Electrical overstress
Neighbouring years
2017 Optima: 257 complaints, keep it, but watch the engine · 2019 Optima: 214 complaints, keep it, but watch the engine.
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 2018 Kia Optima a bad year?
233 owner complaints to NHTSA. Engine complaints: 144, 11× a quiet Optima year. At 71,000 miles the tool says: Consider selling. Half of all engine complaints about the 2018 Kia Optima were filed between 24k and 102k miles. You're at 71,000 miles.
What are the most common problems with the 2018 Kia Optima?
By owner complaints to NHTSA: engine (144), electrical system (33), transmission and drivetrain (19), brakes (17), exterior lighting (14). Half of the engine complaints were filed between 24k–102k miles.
How many recalls does the 2018 Kia Optima have?
2 recall campaigns list this model year: Latches and locks (NHTSA 23V-594), Hybrid system (NHTSA 18V-161). 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.