P0520 on Toyota
Engine Oil Pressure Sensor/Switch Circuit Malfunction
P0520 on Toyota vehicles indicates engine oil pressure sensor/switch circuit malfunction. Au7o has documented this code across 1 Toyota model — most commonly on RAV4. 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.
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 Toyota by Model
Toyota RAV4(1 issue)
- 2019-2024 RAV4 Hybrid/2021-2024 Prime Milky Oil or Low Oil Pressure in Extreme Cold - T-SB-0104-21 Rev22019-2024
Toyota says moisture from blow-by gases may condense and accumulate in the A25A-FXS engine oil during short trips in extreme cold weather. The oil may appear milky or discolored; if the moisture freezes, oil pressure may drop and the Oil Pressure Low warning or MIL may appear with P05202A and/or P052477. This exact bulletin condition is not evidence of the previous card's gasoline-dilution defect, damaging fuel-percent threshold or permanent thicker-oil remedy.
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View P0520 across all makes →Frequently Asked Questions
What does P0520 mean on Toyota?▼
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 Toyota specifically, this code is documented across 1 model.
What causes P0520 on Toyota vehicles?▼
Common causes on Toyota: 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 Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P0520 documented?▼
Au7o has documented P0520 on 1 Toyota model: RAV4.