EngineMedium
1.6L/2.5L turbo oil consumption and rare bearing issues.
- Typically appears
- 50,000+ miles
- What to inspect
- Check oil level and confirm any engine recall completion.
2021–2024 Kia K5 — common problems & known faults
The K5 (formerly Optima) is a sharp midsize sedan. It's reliable but the turbo engines warrant a used-car check.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed July 2026
Known faults to check
TransmissionMedium
8-speed DCT on turbo can hesitate at low speed.
- Typically appears
- Any
- What to inspect
- Test-drive slow-speed take-up for jerkiness.
ElectricalLow
Infotainment reboots and USB/charging faults.
- Typically appears
- Any
- What to inspect
- Test the touchscreen and charging ports.
BrakesLow
Front pad wear on city cars.
- Typically appears
- 40,000+ miles
- What to inspect
- Inspect pad thickness.
Inspecting a Kia K5?
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Try a free reportFrequently asked questions
Is the Kia K5 reliable?
Yes overall — check the turbo engine's oil use and the dual-clutch feel.
Does the K5 have transmission problems?
The DCT can hesitate; a careful test-drive will reveal it.
What should I check on a used K5?
Engine oil use, DCT smoothness and infotainment.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.