how to check and fix low oil pressure warning in Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Tools Required: Socket set, oil pressure gauge, OBD-II scanner, torque wrench
• Ensure the vehicle is on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues during the process.

2. Check and Add Oil

• Remove the dipstick and wipe it clean.
• Reinsert the dipstick and remove it again to check the oil level.
• If low, add the manufacturer-recommended oil type and viscosity until the level is within the acceptable range.

3. Inspect and Replace Oil Filter

• Locate the oil filter and remove it using an oil filter wrench.
• Inspect the old oil filter for any damage or signs of clogging.
• Install a new oil filter, ensuring to lubricate the rubber O-ring with new oil before installation.
• Torque the oil filter according to manufacturer's specifications.

4. Replace Oil Pressure Sending Unit (if necessary)

• Locate the oil pressure sending unit, usually near the oil filter.
• Disconnect the electrical connector and remove the sending unit using a socket.
• Install the new sending unit and reconnect the electrical connector, ensuring it is secure.

5. Verify Oil Pressure with Mechanical Gauge

• Remove the oil pressure sending unit again and install the mechanical oil pressure gauge.
• Start the engine and monitor the oil pressure reading. It should be within the manufacturer’s recommended range at idle and while revving.
• If readings are low, further inspection of the oil pump and engine internals may be necessary.