Advice for buyers
What should I look for in a used Hyundai Sonata saloon?
The Sonata is bolted together solidly and, given proper maintenance, reliable. We aren't aware of any major faults and it should be capable of high mileage if it's looked after.
That's one of the reasons why mini-cab drivers like them - so make sure you don't inadvertently end up with one that has been used for that purpose. Only buy one if it has a fully documented service history, backed up, where appropriate, by MoT certificates.