infiniti m45 P0455 & P1448 codes comes on.

Question

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Should I replace the canister purge valve or the canister? How do I know which one is bad? Where are they located if there's a diagram and a part number that would be great.

Answer 1

the evap canister is under the car, near the trunk (it will have one platic cover being held by 10mm bolts)

P0455- check/tighten gas cap first. (if the rub seal has cracks on it replace the gas cap with a OEM part)

 

P1148

possible causes:

EVAP canister vent control valve

EVAP control system pressure sensor

and the circuit

Blocked rubber tube to EVAP canister

vent control valve

Water separator

EVAP canister is saturated with water

Vacuum cut valve

 

 

P0455

possible causes:

 

-Fuel filler cap remains open or fails to

close.

-Incorrect fuel tank vacuum relief valve

-Incorrect fuel filler cap used

-Foreign matter caught in fuel filler cap.

-Leak is in line between intake manifold

and EVAP canister purge volume control

solenoid valve.

-Foreign matter caught in EVAP canister

vent control valve.

-EVAP canister or fuel tank leaks

-EVAP purge line (pipe and rubber tube)

leaks

-EVAP purge line rubber tube bent.

-Blocked or bent rubber tube to EVAP

control system pressure sensor

-Loose or disconnected rubber tube

-EVAP canister vent control valve and the

circuit

-EVAP canister purge volume control solenoid

valve and the circuit

-Fuel tank temperature sensor

-O-ring of EVAP canister vent control

valve is missing or damaged.

-EVAP control system pressure sensor

-Refueling control valve

-ORVR system leaks