When it comes to the Alfa-Romeo Code P0521, it is important to understand the definition, description and causes of this issue. Alfa-Romeo Code P0521 is a diagnostic trouble code (DTC) that is set when the Variable Valve Actuation (VVA) is unable to enable or remain enabled due to low oil pressure. The engine oil pressure has to be approximately 42 psi for the VVA to enable and 31 psi for the VVA to remain enabled. This code could be caused by ENGINE OIL/ENGINE MECHANICAL, 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND, HIGH RESISTANCE IN THE OIL PRESSURE SENSOR SIGNAL CIRCUIT, HIGH RESISTANCE IN THE SENSOR RETURN CIRCUIT, ENGINE OIL PRESSURE SENSOR, or POWERTRAIN CONTROL MODULE (PCM). It is very important to understand the causes of Alfa-Romeo Code P0521 in order to properly diagnose and fix the issue.
Causes and Solutions for Alfa-Romeo Code P0521
| Cause | Solution |
|---|---|
| ENGINE OIL/ENGINE MECHANICAL | Check and replace oil filter, change engine oil, inspect oil pump, and check for any mechanical issues. |
| 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND | Inspect the 5-volt supply circuit for any open or shorted to ground. |
| HIGH RESISTANCE IN THE OIL PRESSURE SENSOR SIGNAL CIRCUIT | Check the oil pressure sensor signal circuit for any high resistance. |
| HIGH RESISTANCE IN THE SENSOR RETURN CIRCUIT | Inspect the oil pressure sensor return circuit for any high resistance. |
| ENGINE OIL PRESSURE SENSOR | Replace the engine oil pressure sensor if necessary. |
| POWERTRAIN CONTROL MODULE (PCM) | Replace the PCM if necessary. |
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