2018 Hyundai Sonata: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 224 owner complaints for the 2018 Hyundai Sonata that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11769166 (filed 10/05/2026): “What component or system failed or malfunctioned, and is it available for inspection upon request? the paint is peeling off the car, when i went to the dealership they said this is a known problem for 2015-2018, but they can't fix it there is no recall. it is causing rust. the valve cover gasket lea…”
- NHTSA complaint ODI #11765780 (filed 09/21/2026): “Hyundai dealership confirms i am in need of a new engine due to large oil consumption which is a known issue on 2018 hyundai sonata engines. hyundai will not approve repairs because i am the second owner and vehicle is out of the 5 year warranty period. i only have 52k miles on my vehicle.…”
- NHTSA complaint ODI #11763562 (filed 09/11/2026): “One engine valve has lost pressure and is not repairable…”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
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Sources
Page last updated .