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You should see 2 sensors on the oil filter housing. These are oil pressure sending units. Check the electrical connections and wires first. Make sure everything is good, no corrosion, no cracks or breaks in the insulation and no broken wire strands at the connections. If everything is good then one of those sending units is bad. Hope this helps.
check to make sure the oil pressure sensore is working correctly,, you might need a new sensor.
could also be a sign that you are not getting enough oil pressure and this could be caused by a bad oil pump. but check the sensor first and see if this solves the problem.
Get someone to check oil pressure with a mechanical gauge, to verify whether you have oil pressure or not. These engine/vehicles, have 2 warning sensors & a control module in the instrument panel. Once you know you have pressure for sure, then you can proceed from there.
There are two pressure switches. One for oil pressure and one for a dirty oil filter. Are you sure you've changed the right switch. If car drives for 30 mls it doesn't sound like you need an engine. The spluttering is likely to be completely unrelated to the oil warning I suspect.
Sounds like it could be a sludge issue which can be caused from using the incorrect oil. It is a very specific synthetic type of oil that VW suggests and when you don't use it the engine can actually 'gunk' up and cause turbo failure. (This problem happened when a non-vw dealer sold me my car with the wrong type of synthetic in it and my turbo seized)
Google: "1.8t specific oil"
The light and buzzer are indicating low oil pressure and therefor if there is enough oil in th engine then you should have the oil pressure tested because you could have, amingst other things, a worn oil pump, a clogged strainer or a sticking oil filter check valve
Maybe you could try an oil and filter change using a good quality oil filter?