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I need to Replace Evaporative Emissions (EVAP) Control System Pressure Sensor. on 2001 Honda Civic

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How do you do this?
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Replace the FUEL TANK PRESSURE SENSOR underneath car with canister and two-way valve. THEN when the check engine light comes back, diagnose circuit as globalhelper suggested. NORMAL value with cap off is 2.5V kill mouse that chewed wires or vacuum hose.
My check engine light came on. I have the DTC code P0453. My diagnostic scan tool said, "Replace Evaporative Emissions (EVAP) Control System Pressure Sensor." Thanks.
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