Are you having problems with your 2010 Hyundai Sonata? Let our team of motoring experts keep you up to date with all of the latest 2010 Hyundai Sonata issues & faults. We have gathered all of the most frequently asked questions and problems relating to the 2010 Hyundai Sonata in one spot to help you decide if it's a smart buy.
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It would seem to be in the fuel system, so I would be looking at the injectors to find the cause.
It’s generally done in these situations because it has to be removed to replace the water pump anyway, which makes it a convenient and cost-effective time to do it. The fact that it was done 35,000 km ago might make you question the need to do it again so soon, so have the mechanic check it and if it appears in good condition perhaps replace it, but I would err on the side of caution and replace it anyway.