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Check Oil Pressure Sensor Functionality

Model: Volkswagen Transporter T25, T3, MK 3 - Years 1979-1990
Part: Engine oil

There are specific tools available to check the correct functioning of the engine oil pressure sensor (commonly known as the bulb): it is very important that the sensor operates correctly as maintaining the correct pressure level within the engine ensures proper lubrication. First, intercept the wires connected to the bulb: the yellow wire is connected to the warning light and the buzzer and detects a pressure slightly below one atmosphere at 2000 rpm; the blue wire activates the warning light if the pressure is below 0.3 atmospheres; connecting the warning light to the yellow wire should keep it illuminated below 2000 rpm; connecting the warning light to the blue wire should keep it off when the engine is off and it must remain off when the engine is running.

Updated on 14 February 2026 by ScegliAuto

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