The following code is from my 2000 mazda mpv. P0451 evap pressure sensor/switch range/performance. Can anyone tell me where this sensor/switch is located? Thank you

SOURCE: CTS check engine light code P0451

Hi. the fuel pressure sensor is part of the fuel pump assembly. You will have to remove the fuel pump to replace this. I would go ahead and replace the fuel pump while you are there.You will have to Pull the strainer off the fuel pump and discard it. remove the retaining clip for the fuel pressure regulator so that you can remove the fuel pressure regulator. Disconnect the electrical connections for the fuel pumps and the fuel level sensor. Remove the retaining clip for the fuel level sensor and remove the fuel level sensor by squeezing the locking tangs. the sensor is incorporated in this area.

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SOURCE: Code P0451 Explanation

the fuel tank pressure sensor may be the problem. but first check that gas cap is tight and the seal is good on cap. auto parts store will tell you the location of the sensor,or call dealer to find out.