Free repair checklist
Hyundai Sonata Owners Spend $800 More Than They Have To
The Sonata's GDI engine and dual-clutch transmission have specific maintenance needs most dealers skip. This guide shows you what to do — and when — so you stay ahead of the expensive repairs.
This checklist is a practical starting point. The DIY Mechanic System gives you a clearer path to diagnose the problem, plan the job, and complete the repair.
What this checklist covers
- GDI carbon buildup — walnut blast DIY vs $600 shop: when you need it, how to do it yourself for under $100
- Theta II recall awareness — what's covered and what's not, and why some 'fixed' engines still fail
- DCT fluid at 40k saves a $2,500 transmission — the service interval Hyundai buried in the fine print
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