Hi and welcome to 2CarPros.com.
I am sorry, but I do not have the specifics on the Polo 1.4L. However, I have a few questions that may help. First, when the oil pressure shows 0, are the lifters, rod bearings, anything making noise like the engine is starved for oil? Have you confirmed that the oil pressure switch is not faulty or leaking? Take a look through this link. It discusses reasons for low oil pressure.
https://www.2carpros.com/articles/high-or-low-engine-oil-pressure
Let me know the answers to the questions so I can better help you. Also, it is common for the oil pressure switch to begin leaking. The result is a loss of oil pressure signal when nothing is wrong other than the switch. When I have an oil light on, there are no engine noised indicating low pressure, I use a mechanical gauge to determine if the electric gauge is correct. Basically, unscrew the electric switch and screw in the mechanical. That way I can tell if there is actually a problem.
I will watch for your reply.
Take care,
Joe
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Thursday, August 2nd, 2018 AT 8:42 PM