how to fix the low oil pressure light on my BMW 3 Series E90/E91 (2005-2012)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, oil pressure gauge, torque wrench, engine oil, oil filter, oil catch pan.
• Ensure the vehicle is parked on a level surface, and the engine is turned off and cool.
• Disconnect the battery for safety.

2. Check and Add Oil

• Remove the oil filler cap.
• Use the dipstick to check the oil level; if low, add the appropriate oil type as specified in the owner’s manual.
• Replace the oil filler cap securely.

3. Replace Oil Filter

• Tools Required: Oil filter wrench.
• Place an oil catch pan underneath the oil filter.
• Remove the old oil filter using the oil filter wrench.
• Apply a thin layer of fresh oil to the rubber gasket of the new oil filter.
• Install the new oil filter by hand until snug, then tighten with the wrench according to manufacturer specifications.

4. Change Engine Oil

• Place an oil catch pan under the oil pan.
• Remove the oil drain plug and allow the old oil to completely drain out.
• Replace the drain plug and torque it to specifications.
• Pour new engine oil through the oil filler cap, ensuring to use the specified oil type and quantity.

5. Check Oil Pressure

• Reconnect the battery and start the engine.
• Allow it to idle and check for the oil pressure warning light.
• If the light remains on, connect the mechanical oil pressure gauge to the oil pressure sending unit location to measure actual oil pressure.
• If oil pressure is low, replace the oil pump as needed.