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Hi all, I was hoping my first thread to be me starting with my Polo project, but that needs to wait until I fix my other Polo, for which I need a bit of help as a quick search didn't pan out :( Basically the troublesome Polo has issues with cold start. It starts and cuts off almost immediately. After 5 minutes of struggle to rev it, it manages to stay on, and after a while (as it warms up), there is no problem with starting it again... Starting it directly on LPG also has no issues. So generally I though the petrol pump was bust, but I checked with another one, and there is no difference. The only error it has is about the lambda sensor. It had it way before any issues where presented. At some point the catalytic converter was also removed. The throttle body is also clean and working properly. So as I have another 6n2 Polo with the same engine, I wanted to swap the lambda sensors and check if it would change anything. We only managed to swap the MAP sensors and make sure it is not from them, as the lambda sensors apparently are different. So the question at the moment is why are they different? The troublesome Polo is using a square plug sensor, where the other one is using the way cheaper flat plug sensor :) If I get a flat one for the troublesome Polo and just rewire the plug will it work, as this is normally done with other vehicles, using universal lambda sensors with the existing original wiring?