2018 Kia Optima
Common Problems
Ranked from 86 federal NHTSA complaints. Every problem links to the complaint IDs behind it.
12 Common Problems
Ordered by how often owners reported each one to NHTSA. The bar shows how common a problem is relative to the most-reported on this vehicle. Expand any problem to see the federal complaint IDs.
- 1
Excessive Oil Consumption
32complaintsHigh severityEngineThe engine burns oil at an abnormal rate, requiring frequent oil changes.
$400–$4,500est. oil-consumption repair (rings/pcv) · 3–14 hrs laborGet local quotes - 2
Engine Failure and Stalling
20complaintsHigh severityEngineThe engine frequently stalls and fails to start, posing a safety risk.
$4,000–$8,000est. engine replacement · 12–20 hrs laborGet local quotes - 3
Random headlight failures
15complaintsMedium severityElectricalHeadlights randomly turn off and on while driving, posing a potential visibility hazard.
$100–$900est. lighting assembly repair · 0.5–2 hrs laborGet local quotes - 4
Engine Stalling or Seizure
12complaintsHigh severityEngineThe engine frequently stalls or seizes, especially when the oil level is low.
$150–$1,200est. stalling / shutdown diagnosis + repair · 1–5 hrs laborGet local quotes - 5
Oil Light Issues
12complaintsMedium severityEngineThe oil light frequently illuminates, indicating low oil levels or other engine issues.
- 6
Engine stalls at idle due to stop-start system failure
7complaintsMedium severityEngineThe engine frequently stalls at idle when the stop-start system malfunctions.
$150–$900est. stop-start system diagnosis · 1–4 hrs laborGet local quotes - 7
Brake Issues Leading to Loss of Control
6complaintsHigh severityBrakesThe service brakes fail, causing the vehicle to lose control and increasing the risk of accidents.
$150–$1,000est. brake system diagnosis + repair · 1–4 hrs laborGet local quotes - 8
Engine overheating and loss of power
3complaintsHigh severityEngineThe engine overheats and experiences a loss of power, often requiring emergency roadside assistance.
$150–$1,200est. cooling-system diagnosis + repair · 1–6 hrs laborGet local quotes - 9
Fuel Consumption Issues
3complaintsMedium severityOtherThe vehicle consumes fuel at an unusually high rate, requiring frequent refueling.
- 10
Transmission Jerking or Malfunction
3complaintsMedium severityTransmissionThe transmission suddenly jerks or malfunctions, causing the vehicle to lose power or speed.
$200–$2,500est. drivetrain diagnosis + repair · 1–8 hrs laborGet local quotes - 11
Power steering failure
2complaintsMedium severitySteeringThe power steering system fails, causing the steering to become difficult and unsafe to operate.
$200–$1,500est. power-steering / eps repair · 1–6 hrs laborGet local quotes - 12
Steering wheel locks up during braking
2complaintsMedium severitySteeringThe steering wheel locks up intermittently during braking, potentially causing loss of control.
$200–$1,500est. power-steering / eps repair · 1–6 hrs laborGet local quotes
Other years & sources
Data source: U.S. National Highway Traffic Safety Administration (NHTSA) owner complaints and recalls. Problems are clustered and ranked from the complaint record; occurrence counts reflect corroborating complaints, not total incidence. Vehicle image is illustrative. Repair-cost figures are typical U.S. independent-shop ranges (parts + labor) for the class of repair shown — actual quotes vary by region, engine, and diagnosis; always confirm with a local shop.