The Nissan 350Z Vapor Pressure Sensor is responsible for sealing off harmful fuel vapors by tracking the pressure in the tank. This allows the engine computer to detect leaks quickly. Positioned on the fuel tank and connected to the ECM, the Vapor Pressure Sensor measures small variations arising from vacuum tests during the periods when the purge valve opens and the vent solenoid closes. Moreover, it converts the measurements into a voltage signal that indicates whether the EVAP system can retain the required vacuum. Should the reading remain constant or flat, the check engine light comes on, which usually means the fuel cap is loose but also indicates cracks or pinholes that wouldn't normally register. The early models of 350Z applied a simple analog Vapor Pressure Sensor meant only for reporting pressure, while the later models of 350Z adopted a digital and more advanced Vapor Pressure Sensor for the strictly OBD-II self-diagnosis routine, but both versions mount and connect the same way. If the Vapor Pressure Sensor is still healthy, Nissan drivers can avoid any smell of smog, save on mileage, and pass their emissions test without any surprises. So it is a good step for any Nissan owner to do a routine inspection of this small part.
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