I’m going through the same thing right now, 2017 Sonata took it into dealership last Friday for oil change. Service writer says Hyundai issued a recall for a software update for the knock sensor. Would we like it done then? Sure, why not. On the way home, check engine light is flashing, there’s a bad misfire under acceleration. Drive back to dealer, they give me a rental, i go home. talk to service writer later that day, his tech says “needs a new engine wiring harness, have to order it, car will be ready Monday”. Talk to service writer today, that harness didnt work. Tech called Hyundai, their support staff said replace main engine harness. The one they had first told him to change was a sub-harness. With all the harnesses they are sending out, Hyundai should notice that they have a problem here, and figure out how to roll back their software update,
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