P0521 SAAB - Engine Oil Pressure Sensor/Switch Circuit Range/Performance
Low oil level or motor mechanical fault
Faulty oil pressure sensor
Oil Pressure Sensor harness is open or shorted
Oil Pressure Sensor circuit poor electrical connection
When is the code detected?
The P0521 is detected when the signal sent from oil pressure sensor to PCM goes out of range.
Engine Light ON (or Service Engine Soon Warning Light)
Oil pressure warning light ON.
P0521 Saab Description
continuously monitors the engine oil pressure. The Oil Pressure Sensor/Switch sends a signal to the PCM
when the engine is running.