I have seen skip loads of these Polos with the 3 cylinder kiss-of death 6 or 12 valve engines.They all have the usual misfires codes.Most have had everything bolted on or changed,from coils,injectors,sensors and even a reman Ecu!(how do they do that?).The bottom line is this is a nail of an engine that VW will not admit to being a problem.The only cars that seem to be ok,are those that have had timing chain/kit and a modified cyl head and software update,which realistically now makes these an economic write-off.