P0521 - OBD Trouble Code

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Is the car engine not performing at par with the expectations? Do you notice affected performance, engine misfires, delayed throttle response and Check Engine Light illuminated on the dashboard? This can be an indication of the problem the engine oil pressure sensor/circuit of the vehicle, resulting in OBD code P0521 getting stored in the Powertrain Control Module (PCM).

OBD-II Code P0521 is defined as Engine Oil Pressure Sensor/Switch Range/Performance.

The PCM controls a number of sensors, controls and other electronic components. One such sensor is the oil pressure sensor which detects how much mechanical oil pressure is present in the engine. It then sends this reading to the PCM in the form of a voltage value. The PCM will then notify the driver of this information one of two ways. In some vehicles, there is a gauge in the dashboard that will show how much oil pressure there is. In other models, there is no gauge, but a warning light will be activated if there is a problem where oil pressure is concerned.

If the PCM ever detects an unexpected value, the P0521 code is stored. The unexpected value could simply be more or less than the acceptable range or the pressure could simply be fixed in place when it should be fluctuating.

What causes this problem with the Engine Oil Pressure Sensor/Switch Range/Performance?

• Low oil level or motor mechanical fault
• Oil Pressure Sensor Faulty
• Damaged wiring or connection/connector in the Oil Pressure Sender Circuit
• Oil Passage Clogged
• Oil Pump pickup screen Clogged
• Viscosity of Oil Incorrect
• Oil Pump Damaged

1. Oil Pump Screen - Faulty screen can affect the fuel delivery and also hamper the pump. Replace it now!
2. Oil Pressure Sender - Faulty oil pressure sender will affect the engine performance and can even damage the components. Replace it immediately.
3. Powertrain Control Module - PCM can store and flash wrong OBD error if it is itself faulty. Replace the faulty PCM components immediately.
4. Diagnostic Tools - Use professional level tools to detect and correct the OBD code problems. Buy now!
5. Oil Pressure Sensor - Check for any faults in the oil pressure sensor and replace it immediately. Buy new sensor from us.
6. Oil Pump - The oil pump can itself be damaged and leaky and might need replacement. Buy new pump now!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0521 here:

Common Symptoms

• Oil Pressure Warning Light illuminated
• Engine Noise and misfires
• Catastrophic Engine failure
• Noise from the valve train due to loss of oil pressure

Want to correct the Trouble Code P0521? Read these points mentioned below:

• Changing out the oil and/or resetting the oil pressure sensor
• The engine itself may require some serious repairs
• Oil Pump replacement
• Oil Pressure sensor replacement

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0521 code to be stored:

• Connect the OBD scanner and retrieve all the coded and freeze frame the data. After doing that test run the vehicle again under same circumstances to see if the code returns to make sure which codes are persistent (in case of more than one code).
• Begin with a visual inspection of all wiring and connectors. Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as required.
• If engine oil pressure is excessive, suspect a faulty oil pressure sensor or clogged oil filter. Make sure that the engine is filled to the proper level with suitable engine oil. To diagnose the low oil pressure condition, connect the scanner or code reader and make a note of all stored trouble codes and applicable freeze frame data.
• Start the engine and check for leaks by allowing the engine to reach normal operating temperature and make a note of the actual oil pressure reading. Compare your findings with the manufacturer’s specifications and make engine repairs as necessary. If the engine oil pressure is within acceptable specifications, disconnect the oil pressure sensor connector and perform a resistance test on the sensor.
• If the electrical connector face of the oil pressure sensor is contaminated with engine oil, suspect a faulty sensor (it is leaking and should be replaced). If the sensor is within acceptable specifications, disconnect the PCM connector and perform a continuity/resistance test on all wiring circuits.

Common Mistakes When Diagnosing the P0521 Code

It is important to understand that there can be many other factors causing this problem rather than directly blaming the pressure sensor completely. Always check for faulty wirings, and fuses as well as circuits and oil pumps for error too. Take help of professional mechanic to solve OBD code problem as this will ensure avoidance of misdiagnosis and can also help to reduce the costs associated with the repairs.

• Oil pressure sensor failure
• Powertrain Control Module (PCM) failure
• Wiring and connector issues in relation to the sensor and circuits
• Damaged or clogged fuel filter