Looking at the evidence here, as it is a 3 cylinder vw engine, I would hazard a guess that you have a burnt valve(s). Not enough to show up on a compression test. No maf sensor on these.

Edited by elekie&a/c doctor on 09/06/2019 at 20:56

The cat code is not related to your problem. There are plenty of cars running around with this fault and the engine works fine. The other 2 codes could be related to an air leak in the induction system. A non sealing oil filler cap, engine crankcase breather issue, can bring on these last 2.

HI, just an update, had the car looked at by a mechanic, he found that both lambada sensors are showing the same reading when theyre meant to be different? is it a faulty sensor or something else?

The pre cat oxygen sensor should switch between high and low in the range 0 - 1V and the post sensor should maintain a relatively steady 0.5-0.7V at idle. I had a mini cooper with similar problems and found the post cat sensor reading was not stable. I checked for air leaks and finally replaced the pre cat sensor and this cured the stability of the post sensor and the idling and stalling problem.

Which oxygen sensor was replaced?

also if i were to drive with the pre cat sensor disconnected would that help diagnose if it is the sensor?