Genuine Volvo V40 Oil Pressure Switch

Volvo V40 Oil Pressure Switch Parts and Q&A

• Oil Pressure Sending Unit
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  Q: What is the function of the oil pressure switch and how should it be maintained for GDI engine on Volvo V40?

  A:

  The oil pressure switch is an early warning system for low oil pressure that the engine requires, activating the oil warning light on the instrument panel, which should be activated with the ignition and go off shortly after the engine starts. If the light does not light, it can be a problem with the instrument panel, the wiring of the switches, or the switch itself. If the light is staying on there are potential problems of low oil level, worn Oil Pump, blocked sump pick-up, blocked oil filter or worn main bearings or the switch may be defective. If the light comes on during the car drive, it is important that the engine be turned off immediately and not driven until the problem is fixed, as disregard of the warning signal may cause expensively-run engine damage. To take out the oil pressure switch, it's easiest to get underneath the engine, so the front of the car should be lifted on jacks and supported well. The very back section of the undershield has to come off for access - this will be followed by disconnecting the wiring from the switch and unscrewing with an open-ended spanner (note that it may be tight due to thread locking fluid). Minimal loss of oil should occur if the engine has been off for a while. During inspection, the switch should be checked whether it has cracks or splits, and the wiring terminals should be checked whether it is loose, tracing the wire along the main loom, looking for any defects. Refitting is the opposite of the removal process, making sure the switch threads are clean, cleaning the switch threads with thread-locking fluid (being careful not to block the inner end), tightening the switch to the recommended torque, reconnecting the wiring and keeping it away from hot or moving parts, and finally starting the engine to check it's operating properly and to check for oil leaks.