P0466

Symptoms

• Check Engine Light Is On
• Faint smell of fuel from the engine compartment
• Possible slight deterioration in fuel economy
• Unstable engine operation at idle
• Difficulty starting after a long stay

Causes

• Faulty EVAP purge flow sensor
• Clogged or damaged purge valve
• Cracks or breaks in EVAP hoses
• Sensor contamination with fuel vapor or oil
• Electrical connection failure in the sensor circuit
• ECU malfunction (rare)

How to Fix

1. Read and write down all error codes; check for related EVAP codes
2. Visually inspect EVAP system hoses for cracks, kinks, and disconnections.
3. Check the electrical connector of the purge flow sensor: oxidation, damaged contacts
4. Measure the supply voltage and signal wire of the sensor with a multimeter
5. Replace the purge flow sensor if the readings deviate
6. Check the purge valve: apply voltage directly, make sure it opens/closes
7. Check the EVAP system for leaks using a smoke machine
8. Reset codes and test drive to confirm troubleshooting

Related codes

Error P0466 by Vehicle Brand