2016 polo tsi fault

The P2096 code means "Post Catalyst Fuel Trim System Too Lean"

This probably means that air is being sucked into the system that the ECU doesn't know about. Check air intake post MAF and exhaust piping before the CAT. You may see a tiny leak. Small leaks are common on the flexi exhaust pipe and may not be easy to find. If you don't find a leak and have some MAF cleaner spray you could give the MAF a quick spray in case it's dirty and not reading correctly. Beyond this --- garage! as it may be another sensor that's off.