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P0466 is a diagnostic trouble code (DTC) for "Purge Flow Sensor Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The powertrain control module (PCM) has detected a problem in the EVAP system and stored a trouble code.
The EVAP system controls fumes from the fuel tank, stores them in the charcoal canister and directs them back into the engine where they can be burned like fuel. The EVAP system’s components include the gas cap, fuel lines, purge valve and charcoal canister, system pressure/flow sensors, electrical wiring/connectors, vacuum lines, fuel tank and fuel vapor hoses, among others. A code is set in the PCM when a sensor in the system sends voltage that’s outside of normal parameters. While some vehicles require multiple cycles for the MIL to illuminate, a code will usually be stored on the first failure. Stored codes without an illuminated MIL may read as pending codes.
There may be no outward symptoms of a P0466 code other than an illuminated MIL, but other EVAP or emissions-related codes may accompany it.
The EVAP system captures fuel vapors from the fuel tank and lines and prevents them from escaping into the atmosphere. This is accomplished by engine vacuum, a charcoal storage reservoir canister and electric solenoids. Plastic or metal hoses supply flammable fuel vapors to the canister, where they are stored until a signal from the PCM activates the purge control solenoid and opens the purge control valve.
While the engine is running, the purge control valve allows engine vacuum to bring the fuel vapors into the engine’s intake, where they can be burned. The canister is usually located under the vehicle by the fuel tank. Lines from the charcoal canister to the engine are quite long and are prone to damage from road debris and the elements.
A scanner/code reader, digital volt/ohmmeter (DVOM) and smoke machine will be useful in a diagnosis of code P0466.
Often, EVAP components are replaced when the problem was nothing more than a vacuum leak or loose fuel cap.
A P0466 code may not affect drivability, but it can cause a vehicle to fail an emissions test.
In most cases, a P0466 code or other EVAP codes are due to problems with the charcoal canister or fuel cap. Start with those and work your way through the system from there.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.