Kia Optima2017

Known issues

• DPF (diesel particulate filter) clogging and regeneration issues, particularly on low-mileage urban driving; can result in limp mode and expensive cleaning or replacement (€800–€1,500)
• CRDi fuel injector problems, including sticking injectors and carbon build-up leading to rough idle, starting difficulty, and increased emissions
• EGR valve fouling and stiction, causing reduced performance and potential engine management warnings
• Turbocharger bearing wear and occasional turbo lag; some reports of premature wear around 80,000–120,000 miles
• AdBlue system faults and sensor errors; incorrect AdBlue quality or contamination can trigger warning lights and limp mode
• Transmission shudder or hesitation in manual variants; DSG dual-clutch (if automatic) can exhibit low-speed judder

Good for

• Strong fuel economy on motorway driving; genuine 45–50 mpg achievable with steady cruising
• Spacious interior and comfortable ride quality for long-distance commuting
• Relatively low purchase price in the used market compared to German equivalents
• Proven 2.0 CRDi engine platform with broad parts availability through independent suppliers