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Hi Cliff, I guess I will never find out since is sold now but for what is worth. [1] The oil pump is worn. >>> it was generating pressure and if I remember good was 2.5bar at idle speed and close to 5bar al speed [2] The pressure relief valve is faulty. >>>> not sure where this one is.... the oil filter and the oil filter house was replace with a new one [3] The engine bearings are worn. >>>> Maybe [4] The pressure switch is faulty. >>> I did replace it with a brand new one and made no difference [5] The pump is sucking in air. >>> it was opened and checked But for sure somewhere was loosing pressure and now is not. P.S if I was driving with manual gear ( is automatic version) and I was changing the gears around 1.8k - 2k RPM the oil pressure light was not coming up anymore. As soon as I switch to automatic gear it will show the pressure light but only for a short period of time and then disappear. In automatic is changing gears at lower RPM then 1.7k Best regards.

Hi Gareth, I like your subtlety here. 🙂 On the box is written : Synthetic-based technology. ACEA A3/B4 - API SN/CF VW 501.01 / 505.00

Hi Gareth, I totally understand this but please note that the oil I have put is synthetic and NOT semi-synthetic and is for my type of petrol engine. Also I know that after 100k Km the viscosity of the oil should increase to accommodate for the wearing out of the parts ( correct?!) . I don't think you can stick with the same 5W30 until the end of lifetime of any engine, unless you change some of the inner parts. Kind regards.

Hi, Just a small mention to my last post.. the oil that I have put was Motul and not Motion. Anyway, the problem was fixed not by replacing the oil pressure sensor that was also changed with a new original one and was resolved by changing for a third time the oil from 5W30 to 10W40. All the best and thank you for support.

Hello guys. So the work done by the mechanic was as fallows: he clean the engine with a solution that he added in the oil, he verified the pressure of the oil, he cleaned the oil pan and check the oil pomp. He found that inside the oil filter house the pressure valve was missing so a new one was put ( the previous maintenance was done wrong and the mechanic from there throw it away 🤬). Oil was change from Castrol to Motion 5w30 and a new filter. He also checked the oil sensor pressure, clean it and put it back. Today I had to leave from the city were this was made and getting back to my busy home city and the oil pressure gauge got lit. I have call back the mechanic and he said that maybe the oil pressure sensor is causing this. I will see now change this sensor. I feel sorry that I didn't change together with the everything else. I need to sell this car 😂😂...

Hi. Due to my working hours and not being able to find a decent place to do the replacing of the sensor and oil filter on the spot and long waiting hours, I have decided to give it to some mechanic that will, according to him, clean the system, oil pump and all the components and verify if they are damaged plus the pressure test. It will be done next week and I'll get back with what he found. Best regards, Octavian

Thank you for the reply Gareth. I will go ahead and replace the oil pressure sensor and the oil filter but not in the same time so I can pinpoint the culprit. If this doesn't solve it I will change the oil with a different brand. Best regards, Octavian

Hi Chris. What was the fix in your case?

Hello guys, i have a similar problem with my A3 2.0 TFSI 2005 model (156000Km). I have just changed the oil and the filter and when the engine temperature gets to the optimal running temperature 90*C at around 1600rpm( coincidence) i get the same oil pressure warning light. I have measured the oil pressure but when temperature was low and i had 2.6bar / close to 40PSI at idle speed and at 2000-3000rpm i had 5bar and a bit/ 80psi. Also the oil pressure sensor had a bad wire that according to the mechanic was fixed. The light stays lid for a short period of time (less then a minute) and disappears, but not for long as comes back again and again at random times. Can it be because of bad oil quality Castrol Edge 5W30 LL or the sensor or maybe something else at the engine? No visible leaks found.