P0521 – BMW DTC

BMW DTC P0521 – Engine Oil Pressure Sensor/Switch ‘A’ Range/Performance

DTC P0521 meaning on BMW

The DTC P0521 for BMW indicates an issue with the Engine Oil Pressure Sensor/Switch ‘A’ Range/Performance. This fault code is triggered when the engine control module (ECM) detects that the oil pressure sensor or switch is reporting a pressure value outside the expected range or performance parameters.

BMW DTC P0521 symptoms

Symptoms of a DTC P0521 on a BMW may include:

• Illuminated oil pressure warning light on the dashboard
• Low oil pressure warning message
• Engine running rough or stalling
• Loss of power

BMW DTC P0521 causes

Common causes of a DTC P0521 on a BMW include:

• Defective oil pressure sensor or switch
• Low engine oil level
• Engine oil that is too thin or contaminated
• Wiring or connector issues in the oil pressure sensor circuit

BMW DTC P0521 seriousness

Ignoring a DTC P0521 on a BMW can lead to serious engine damage due to inadequate lubrication. It is important to address this issue promptly to prevent potential engine failure.

How to diagnose DTC P0521 on BMW

To diagnose a DTC P0521 on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and any related codes
2. Inspect the engine oil level and condition
3. Check the wiring and connectors in the oil pressure sensor circuit for any damage or corrosion
4. Test the oil pressure sensor or switch for proper operation

How to fix DTC P0521 on BMW

To fix a DTC P0521 on a BMW, you may need to:

1. Replace the faulty oil pressure sensor or switch
2. Top up the engine oil to the correct level
3. Change the engine oil if it is contaminated or too thin
4. Repair any wiring or connector issues in the oil pressure sensor circuit

How to erase DTC P0521 on BMW

To erase a DTC P0521 on a BMW, you can:

1. Use a diagnostic scanner to clear the fault code
2. After fixing the underlying issue, drive the vehicle to allow the ECM to perform a self-check and verify the repair

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

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