Hyundai Sonata 2.4L Theta II · 2013
Manufacturing debris left in the crankshaft oil passages during production is the root cause behind a well-known Theta II 2.4L issue: rod bearings wear down over tens of thousands of miles, leading to a knocking noise, sudden oil pressure loss, and in the worst cases the engine stalling while driving. This is genuinely urgent - a stall in traffic is a real safety risk, not just a repair inconvenience. Hyundai and Kia extended engine warranty coverage to 10 years/120,000 miles on affected models for exactly this reason, so check your VIN with a dealer before paying for a rebuild or replacement out of pocket.
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