P0521 — Engine Oil Pressure Sensor/Switch Range/Performance
Seen on: Heavy Truck
Engine Oil Pressure Sensor/Switch Range/Performance. Common causes: Oil pressure sensor reading inconsistent.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- Oil pressure sensor reading inconsistent
- Aerated oil
- sensor fault
First moves (roadside)
- Compare mechanical gauge to sensor
- check for aeration in oil system
FAQ
Engine Oil Pressure Sensor/Switch Range/Performance. Common causes: Oil pressure sensor reading inconsistent.
Caution — Limp to the next safe stop.
The most common cause is: Oil pressure sensor reading inconsistent. Other possibilities include Aerated oil; sensor fault.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.