How can I test the sensor switch?

The model of the car is a 98' Nissan 200sx. I went to inspection two days ago and failed. I was given the P0450- Evap Emission system pressure sensor switch. I've changed the EVAP canister , Vacuum Cut Valve, and the bypass valve. The problem might be coming from the front near the engine area. How can I... show more The model of the car is a 98' Nissan 200sx. I went to inspection two days ago and failed. I was given the P0450- Evap Emission system pressure sensor switch. I've changed the EVAP canister , Vacuum Cut Valve, and the bypass valve. The problem might be coming from the front near the engine area. How can I test the sensor switch and how can I tell if it's working?
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