The P0521 trouble code indicates that the engine oil pressure sensor or switch circuit is experiencing a range or performance issue. This sensor or switch is responsible for monitoring the engine oil pressure and sending signals to the Engine Control Module (ECM). If the ECM detects that the oil pressure readings are outside the expected range or the performance of the circuit is not as expected, it will trigger the P0521 trouble code.
Engine Oil Pressure Sensor/Switch Range/Performance
Code symptoms P0521.
1. Check Engine Light (CEL) is illuminated on the dashboard.
2. Low oil pressure warning light is displayed on the instrument cluster.
3. Fluctuating or inaccurate oil pressure readings on the gauge.
4. Engine may run rough or stall.
5. Loss of engine power or hesitation during acceleration.
6. Potential engine damage if oil pressure is too low for an extended period.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0521.
1. Faulty engine oil pressure sensor or switch.
2. Wiring or connector issues in the oil pressure sensor circuit.
3. Low engine oil level or contaminated oil.
4. Oil viscosity issues.
5. Faulty Engine Control Module (ECM), although this is rare.
Code Solutions P0521.
1. Check the engine oil level and condition. Top up the oil if low and replace if contaminated or degraded.
2. Inspect the wiring and connectors associated with the oil pressure sensor for damage, corrosion, or loose connections. Repair or replace damaged components as needed.
3. Test the oil pressure sensor or switch using a multimeter to ensure it is functioning correctly. Replace the sensor if it is found to be faulty.
4. Clear the trouble codes from the ECM and perform a test drive to see if the issue recurs. If the code returns, further diagnosis may be required to identify the root cause of the malfunction.
5. If unsure about diagnosing or repairing the issue, consult a qualified mechanic for assistance. They have the necessary tools and expertise to diagnose and repair oil pressure sensor or switch circuit range or performance issues effectively.