Faulty EVAP purge flow switch or sensor, or a failed signal from it; Purge control (canister purge) solenoid valve stuck open or closed; Damaged, blocked, kinked or disconnected EVAP vacuum hoses or pipes between the canister, purge valve and intake; Wiring or connector fault in the switch or purge valve circuit (open circuit, short, corrosion or chafing); Blocked, saturated or damaged EVAP canister, or a restricted vent path; Fault within the engine control unit.

P1459

EVAP Purge Flow Switch Malfunction.

Infiniti
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
59: FaultThe specific fault in that area

What it means

P1459 on an Infiniti means the engine control unit has detected a fault with the evaporative emission (EVAP) purge flow switch or its circuit. The control unit expects the purge flow signal to change when the purge control valve opens and closes, and it saw a reading that did not match what it commanded. Exact test conditions and the type of switch fitted vary by model and year, so check the factory data for the vehicle in front of you.

Symptoms

Malfunction indicator lamp on
Difficulty refuelling, with the pump nozzle clicking off repeatedly
Slight fuel smell around the car or near the fuel filler
Rough idle or hesitation after refuelling or when purge begins
Failed emissions test or readiness monitor for the EVAP system not completing

Possible causes

Faulty EVAP purge flow switch or sensor, or a failed signal from itlikely
Purge control (canister purge) solenoid valve stuck open or closedlikely
Damaged, blocked, kinked or disconnected EVAP vacuum hoses or pipes between the canister, purge valve and intakelikely
Wiring or connector fault in the switch or purge valve circuit (open circuit, short, corrosion or chafing)possible
Blocked, saturated or damaged EVAP canister, or a restricted vent pathpossible
Fault within the engine control unitrare

How to diagnose

Read the stored codes and freeze frame data, noting engine temperature, load and fuel level when the fault set, then check for any other EVAP codes
Visually inspect the EVAP hoses, pipes and connectors from the fuel tank to the canister, purge valve and intake for cracks, splits, kinks or disconnection
Inspect the wiring and connectors at the purge flow switch and purge control valve for corrosion, bent pins, chafing or water ingress
Check the fuel filler cap is fitted correctly, the seal is intact and the correct type
Use live data to compare the purge flow switch signal with the commanded purge valve state, and activate the valve with a suitable scan function if the model supports it
Test the purge control valve for operation and sealing, checking resistance against the manufacturer specification and listening for it clicking
Check the switch supply, earth and signal circuits for continuity and shorts using the wiring diagram for that model
Check the canister and vent path for blockage or fuel contamination, following the model's service procedure

How to fix

Replace the purge flow switch or sensor if it is faulty or its signal is implausible
Replace the purge control solenoid valve if it sticks or leaks
Repair or replace damaged, blocked or disconnected EVAP hoses and pipes
Repair the wiring or connectors and clear any corrosion in the circuit
Replace a blocked or contaminated EVAP canister or clear the restricted vent path
After repair, clear the code and complete a drive cycle to confirm the EVAP monitor runs and passes

Can I keep driving?

Low severity

The car can normally be driven while you book it in, as this fault does not usually affect safety or cause engine damage. Fix it soon to avoid fuel vapour emissions, a fuel smell, refuelling problems and an emissions test failure.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.