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    Why is my 2020 Hyundai i30 misfiring?

    Asked by Leigh

    I have a 2020 Hyundai i30 sedan with a strange intermediate misfire when cold starting. It seems to run like it’s missing a cylinder every few days when cold. I’ve had the RAC out three times and the car has been back to the shop three times. The engine light has come on twice for a knock sensor fault. I’m guessing that’s because of the way it starts. Hyundai can’t fault it and tell me its fine. It's going back again tomorrow and hopefully we can resolve the problem as it's starting to cause stress and anxiety as it's my wife's car and she refuses to drive it when it happens. Any advice?

    Answered by CarsGuide

    24 Mar 2021 David Morley

    This sounds like a problem that should be easily solvable by having your Hyundai dealership electronically scan the car and interpreting the fault codes that result. This can’t be done by the side of the road or in your driveway, so I doesn’t surprise me that your road-service provider hasn’t had much success.

    Fundamentally, though, it’s simply not good enough for the dealership to continue to tell you it can’t find a problem. This is a brand-new car and it’s expected to perform faultlessly or, at the very least, to a standard that does not give your partner cause to refuse to drive it. The car is under warranty, so Hyundai is obliged to fix it. If you’re not happy with your dealership’s approach, I’d suggest calling Hyundai’s customer service department. Hyundai guards its reputation very closely in Australia, and isn’t likely to let a case like yours damage that.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.

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