P0452 2018 Toyota RAV4 Code - Evaporative Emission Control System Pressure Sensor / Switch Low Input

Code P0452 indicates that the Evaporative Emission Control System (EVAP) pressure sensor is reporting a low voltage signal to the engine control module (ECM), suggesting a potential issue with detecting fuel system pressure.

Typical symptoms include an illuminated check engine light, reduced fuel efficiency, potential difficulty refueling, and possibly a faint fuel odor near the vehicle.

Common causes include a faulty EVAP pressure sensor, damaged or loose wiring or connectors, a blocked or clogged EVAP vent line, or a malfunctioning ECM.

Unlikely. A loose gas cap typically triggers a P0457 (EVAP system leak detected). However, inspecting the gas cap is still a good first step when diagnosing EVAP-related issues.

Check the EVAP pressure sensor for damage or failure, inspect wiring and connectors for corrosion or loose connections, and ensure there are no blockages or damage in the EVAP vent lines. Replace defective parts as needed.

Yes, it’s usually safe to drive with this code, but it may affect fuel efficiency and emissions. Long-term neglect could lead to more costly repairs or issues during an emissions test.

Repair costs vary depending on the cause. Replacing an EVAP pressure sensor typically costs $100–$300, including parts and labor. Wiring repairs may cost less, depending on the complexity.

You can clear the code using an OBDII scanner, but it will likely return if the underlying issue isn’t resolved.

Use a multimeter to check the sensor’s voltage and resistance according to factory specifications. If readings are out of range, the sensor may need replacement.

Yes, a P0452 code will likely cause your vehicle to fail an emissions test because it indicates an issue with the EVAP system, which controls fuel vapor emissions.