Possible causes

– Faulty EVAP control system pressure sensor
– Faulty EVAP canister purge volume control solenoid valve (The valve is stuck open.)
– Faulty EVAP canister vent control valve
– Faulty EVAP canister
– Hoses (Hoses are connected incorrectly or clogged.)

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1445 NISSAN Description

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the Engine Control Module (ECM). The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.

NISSAN Technical Service Bulletins for P1445 code