P0520 on Ford
Engine Oil Pressure Sensor/Switch Circuit Malfunction
P0520 on Ford vehicles indicates engine oil pressure sensor/switch circuit malfunction. Au7o has documented this code across 2 Ford models — most commonly on EcoSport, Transit. This code indicates a general electrical fault in the circuit for the engine oil pressure sensor or switch. The computer monitors this circuit to know your oil pressure, and it has detected a signal that is missing, shorted, or otherwise out of the expected electrical range. This is typically a wiring or sensor problem rather than an actual loss of oil pressure, but because oil pressure is critical to engine life, it should never be ignored until confirmed. If oil pressure truly is low, serious engine damage can result. Typical repair costs on Ford range from $50 to $6,000, depending on the specific model and root cause.
Common Causes of P0520
- •Faulty oil pressure sensor or switch
- •Damaged, corroded, or loose wiring/connector at the sensor
- •Open or short in the sensor circuit wiring
- •Poor ground connection
- •Low engine oil level or genuinely low oil pressure
- •Failed PCM/ECM (less common)
P0520 on Ford by Model
Ford EcoSport(1 issue)
- 1.0L EcoBoost Oil Pump Belt Tensioner Failure Leading to Engine Seizure2018-2022
The 1.0L EcoBoost three-cylinder engine in the Ford EcoSport uses a belt-driven oil pump with a spring-loaded tensioner. The tensioner can fail, causing the oil pump drive belt to slip or break. When the belt fails, the oil pump stops operating and the engine loses oil pressure within seconds, leading to catastrophic bearing damage and engine seizure. Ford issued a TSB and later a recall (NHTSA 23V905000) in December 2023 covering 2018-2022 EcoSport vehicles. The failure can occur without warning, and the engine may stall while driving.
Ford Transit(1 issue)
- Oil Pan Drain Plug Thread Stripping2015-2024
The Ford Transit aluminum oil pan is prone to drain plug thread stripping, especially in vehicles serviced at quick-lube shops or with frequent oil changes. The aluminum pan threads are softer than the steel drain plug, and over-torquing or cross-threading during routine oil changes permanently damages the threads. Once stripped, the drain plug leaks oil or falls out entirely, potentially causing catastrophic engine damage from oil starvation.
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View P0520 across all makes →Frequently Asked Questions
What does P0520 mean on Ford?▼
P0520 stands for "Engine Oil Pressure Sensor/Switch Circuit Malfunction." This code indicates a general electrical fault in the circuit for the engine oil pressure sensor or switch. The computer monitors this circuit to know your oil pressure, and it has detected a signal that is missing, shorted, or otherwise out of the expected electrical range. This is typically a wiring or sensor problem rather than an actual loss of oil pressure, but because oil pressure is critical to engine life, it should never be ignored until confirmed. If oil pressure truly is low, serious engine damage can result. On Ford specifically, this code is documented across 2 models.
What causes P0520 on Ford vehicles?▼
Common causes on Ford: Faulty oil pressure sensor or switch, Damaged, corroded, or loose wiring/connector at the sensor, Open or short in the sensor circuit wiring, Poor ground connection, Low engine oil level or genuinely low oil pressure. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0520 on a Ford?▼
Repair costs on Ford range from $50 to $6,000, depending on the specific model and root cause.
Which Ford models have P0520 documented?▼
Au7o has documented P0520 on 2 Ford models: EcoSport, Transit.