P0520: Engine Oil Pressure Sensor/Switch Circuit Malfunction
18 vehicles · 10 makes
P0520 is an OBD-II diagnostic trouble code meaning “Engine Oil Pressure Sensor/Switch Circuit Malfunction.” The oil pressure sensor circuit is reporting abnormal readings. Must verify actual oil pressure to rule out mechanical issue. This code appears across 18 vehicle models from 10 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0520, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (18)
2.7L V6 Engine Oil Sludge and Seizure
3.5L V6 Engine Oil Sludge and Consumption
3.5L V6 Excessive Oil Consumption
3.3L/3.8L V6 Engine Oil Leaks
2.7L V6 Oil Sludge and Engine Failure
2.7L V6 Engine Oil Sludge and Seizure
2.7L V6 Engine Oil Sludge and Oil Starvation
2.7L V6 Engine Oil Sludge Buildup and Failure
2.7L V6 Engine Oil Sludge and Seizure
2.7L V6 Oil Sludge and Engine Seizure
2.7L V6 Oil Sludge Buildup and Engine Failure
FAQ
What does P0520 mean?
P0520 stands for "Engine Oil Pressure Sensor/Switch Circuit Malfunction." The oil pressure sensor circuit is reporting abnormal readings. Must verify actual oil pressure to rule out mechanical issue.
What are the most common causes of P0520?
The most common causes of P0520 are: Faulty oil pressure sensor, Wiring issue, Corroded connector, Low oil level, Worn oil pump. The specific cause varies by vehicle.
How much does it cost to fix P0520?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0520?
Au7o has documented P0520 across 18 vehicle models from 10 manufacturers: Cadillac, Chrysler, Dodge, Ford, Hyundai, Jeep, Kia, Mercedes-Benz, Porsche, Subaru.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.