P0459

Symptoms

• Check Engine light is on
• The smell of fuel near the car
• EVAP System Purge Test Failure
• Slight enrichment of the fuel mixture (if the valve is stuck open)
• Unstable idle under some conditions
• Increased fuel consumption in the long term

Causes

• Open circuit in the EVAP purge valve control circuit wiring
• Shorting the control wire to power
• Internal open in purge valve solenoid
• Damaged or oxidized valve connector
• Malfunction of the EVAP system power relay (on some cars)
• Damage to the ECU control circuit (rare)

How to Fix

1. Find EVAP purge valve A using the car's wiring diagram
2. Inspect the valve connector and wiring for damage.
3. Check the resistance of the valve solenoid (normal 15–30 ohms; infinity - open)
4. Check the control circuit from the computer to the valve for an open circuit and short to power
5. Apply 12V voltage directly to the valve - it should click and open
6. Replace the purge valve if the solenoid is broken internally
7. Eliminate wiring damage due to external causes
8. Reset code and perform EVAP test

Related codes

Error P0459 by Vehicle Brand