2018 Kia Sportage engine problems
86 owner complaints filed with NHTSA name the engine on the 2018 Kia Sportage — 54% of all complaints for this model year.
What owners report
“The engine consumes excessive oil due to the known Theta II piston oil control ring defect that the manufacturer documents in its own Technical Service Bulletin ENG222, covering this engine family across model years 2011 to 2024. The vehicle loses over one quart of oil per 1,000 miles with no…”
filed Jul 17, 2026
“I received a voluntary emissions update letter from kia, and although it was voluntary, the letter said failure to update could be considered lack of maintenance. The update was performed on XXX at Dorsch Ford/Kia in [XXX]. The vehicle ran poorly from that day forward. I gave it a couple of weeks…”
filed Jun 4, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSIONS: ECM LOGIC IMPROVEMENT (SC340 REVISION 5) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are…
SC340_TSB_R5 · Emissions · issued Apr 4, 2026VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION (SC340 FLIGHT 105) - This document is the owner notification advising that Kia is conducting a Voluntary Emissions Service Campaign to improve the emissions…
SC340_OWNR_NQ5_105 · Emissions · issued Mar 17, 2026VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION (SC340 FLIGHT 103 / QL) - This document is the owner notification advising that Kia is conducting a Voluntary Emissions Service Campaign to improve the emissions…
SC340_OWNR_QL103 · Emissions · issued Dec 19, 2025TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340) - This bulletin has been revised to include additional information. New/revised sections of…
SC340_TSB_R3 · Service Bulletin/Repair Instructions · issued Dec 10, 2025
Engine problems in other Sportage years
| Year | Reports | Share |
|---|---|---|
| 2025 Sportage | 6 | 12% |
| 2024 Sportage | 9 | 14% |
| 2023 Sportage | 37 | 20% |
| 2022 Sportage | 20 | 44% |
| 2021 Sportage | 20 | 42% |
| 2020 Sportage | 71 | 45% |
| 2019 Sportage | 35 | 51% |
| 2017 Sportage | 219 | 55% |
| 2016 Sportage | 58 | 45% |
| 2015 Sportage | 84 | 58% |
| 2014 Sportage | 71 | 58% |
| 2013 Sportage | 300 | 79% |
Other reported problem areas on the 2018 Kia Sportage
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.