This is the latest on the 1.5 TSI issues. To sum up, VW Group say they've fixed the 1.5 TSI with a software update but many owners still report issues: www.honestjohn.co.uk/news/driving-1/2020-07/volksw.../

Test drive the car when it's cold and see if you can take it away to drive it for a bit longer. Dealers are usually quite good at letting you take it for an extended drive to see how you get on with it. Make sure you really get a feel for how it feels moving between standstill, first and second gear. I would also be asking the dealer - via email - if it's suffering any issues they know about if it's had the fix (which I assume it has). That way you have some comeback if things go awry after you buy it (if you buy). You can read about how we struggled with a SEAT Arona with the same issue, that way you know what to look out for too: www.honestjohn.co.uk/our-cars/seat-arona/hopping-m.../