Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Vapor Pressure Sensor (RX300)
The Engine Control Module (ECM) monitors fuel tank pressure to determine if a leak or an abnormality exists in EVAP system. Vapor pressure sensor is located on top of fuel tank. A vapor pressure sensor Vacuum Switching Valve (VSV) is located in vapor line at EVAP canister. ECM will operate VSV, allowing vapor pressure sensor to monitor fuel tank pressure and EVAP system. EVAP delivers an input signal to ECM to indicate fuel tank pressure.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.