how to fix P0520 oil pressure code in my BMW 3 Series F30/F31 (2012-2019)

BMW 3 Series F30/F31 (2012-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0520

4 min read

647 words

Problem Statement

The vehicle is displaying a P0520 code, indicating an issue with the engine oil pressure sensor or its circuit in a BMW 3 Series (F30/F31) manufactured between 2012 and 2019.

Error Code

P0520

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the oil drain plug to prevent burns.

Symptoms

•Check engine light illuminated
•Low oil pressure warning on the dashboard
•Engine stalling or rough idle
•Decreased engine performance
•Unusual engine noises (ticking or knocking)

Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to confirm the P0520 code and check for any additional error codes.
2
Inspect the engine oil level and condition to ensure it is within the recommended range and not contaminated.
3
Visually inspect the oil pressure sensor and wiring harness for any signs of damage, corrosion, or loose connections.
4
Test the oil pressure using an external oil pressure gauge to determine if the engine is experiencing actual low oil pressure.
5
Check the continuity and resistance of the wiring leading to the oil pressure sensor with a multimeter to identify any open circuits or shorts.
6
If applicable, inspect the oil filter for any obstructions or problems that could affect oil flow.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Oil pressure gauge
•Multimeter
•Socket set
•Torque wrench
•Oil filter wrench

Parts Required

•New oil pressure sensor
•Engine oil (as specified in the owner's manual)
•Oil filter (if changed)

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Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to confirm the P0520 code and check for any additional error codes.
2
Inspect the engine oil level and condition to ensure it is within the recommended range and not contaminated.
3
Visually inspect the oil pressure sensor and wiring harness for any signs of damage, corrosion, or loose connections.
4
Test the oil pressure using an external oil pressure gauge to determine if the engine is experiencing actual low oil pressure.
5
Check the continuity and resistance of the wiring leading to the oil pressure sensor with a multimeter to identify any open circuits or shorts.
6
If applicable, inspect the oil filter for any obstructions or problems that could affect oil flow.

Solution

1. Preparation

Gather tools and parts: OBD-II scanner, oil pressure gauge, multimeter, socket set, torque wrench, new oil pressure sensor.
Ensure the vehicle is on a level surface and the engine is cool.

2. Change Engine Oil and Filter (if necessary)

Sub-steps:
- Raise the vehicle using a jack and secure with jack stands.
- Remove the oil drain plug and drain the old oil into a suitable container.
- Replace the oil filter using an oil filter wrench, ensuring the gasket is seated correctly.
- Reinstall the oil drain plug and tighten to the manufacturer's torque specifications.
- Refill the engine with the recommended type and amount of oil.

3. Replace the Oil Pressure Sensor

Sub-steps:
- Disconnect the battery to prevent electrical shorts.
- Locate the oil pressure sensor (typically near the oil filter or on the engine block).
- Disconnect the electrical connector from the oil pressure sensor.
- Use a socket wrench to remove the old oil pressure sensor.
- Apply a small amount of oil to the threads of the new sensor to ensure proper sealing.
- Install the new oil pressure sensor and tighten it to the specified torque.
- Reconnect the electrical connector.

4. Reconnect Battery and Clear Codes

Sub-steps:
- Reconnect the battery terminals.
- Use the OBD-II scanner to clear the P0520 code and any other stored codes.

5. Test the Vehicle

Sub-steps:
- Start the engine and allow it to idle, monitoring for any warning lights.
- Take the vehicle for a test drive to ensure that the check engine light does not return and that oil pressure readings are normal.