P0466 OBD-II Trouble Code: Purge Flow Sensor Circuit Range/Performance

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0466 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0466 code

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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0466 DIAGNOSTIC Get a fair and transparent estimate upfront

diagnostic check engine light

P0466 code definition

The powertrain control module (PCM) has detected a problem in the EVAP system and stored a trouble code.

What the P0466 code means

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.

What causes the P0466 code?

  • Loose or faulty fuel cap
  • Failed purge control solenoid
  • Clogged or broken charcoal canister
  • Broken, cracked, or deteriorated vacuum/fuel vapor hoses
  • Faulty pressure or flow sensor

What are the symptoms of the P0466 code?

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.

How does a mechanic diagnose the P0466 code?

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.

  • Visually inspect all wiring and connectors and repair/replace any damaged, disconnected, corroded, shorted wiring, connectors or components as needed.
  • If all wiring, connectors and components appear to be in good shape, connect the code reader to the diagnostic connector. Record all stored codes, freeze frame data and clear the codes.
  • Test drive the vehicle to see if codes return.
  • If the codes return, start your diagnostic process by removing and replacing the fuel cap, clear the code again, then test drive the vehicle to see if the code returns. NOTE: Several drive cycles may be needed for the MIL to illuminate.
  • If the code(s) return, visually inspect the vacuum lines and fuel vapor hoses for cracks, splits, kinks, breakage, loose fittings or deterioration. Repair/replace as needed.
  • Inspect the charcoal canister and purge valve for damage or corrosion, replace any faulty parts as needed.
  • Place the vehicle on a lift and start the engine. From underneath, listen closely to the purge control solenoid. Listen for vacuum leaks near the purge control valve, or the hose that runs from the purge valve to the intake.
  • When the solenoid begins making a clicking noise, the purge valve should be opening and closing.
  • Place the smoke machine’s nozzle into the vacuum supply hose for the purge solenoid, allowing it to fill the system with smoke. Watch closely for escaping smoke from lines, hoses or system components. Pay particular attention to smoke from the gas cap, as faulty fuel caps are common.
  • The charcoal canister is vented, so smoke will escape slowly from the unit. This is normal.
  • Liquid can infiltrate the charcoal canister, clogging it and impeding purge flow. With the purge solenoid open, check for suction at both sides of the canister. If there is suction to the canister, it is likely to have failed.
  • Remove the canister and shake it, listening for any rattles from broken or loose particles. Replace as needed.
  • If the canister looks normal, check fuel vapor hoses for kinks or crushed areas.
  • If the canister/lines appear normal, test the purge control solenoid. It should act as an on/off valve, completing a circuit powered by the battery at normal battery voltage.
  • If the solenoid is faulty, an EVAP control circuit code should accompany P0466. If this is the case, inspect connectors and wiring for signs of corrosion or damage. Repair as needed.
  • If wiring and connectors appear to be good, unplug the connector from the PCM and perform a resistance check on the purge control solenoid, system pressure/flow sensors and system wiring.
  • Compare your findings to manufacturer’s specs. Repair as needed.
  • Reset the codes and test drive the vehicle, keeping in mind that multiple drive cycles may be needed for the code to return.

Common mistakes when diagnosing the P0466 code

Often, EVAP components are replaced when the problem was nothing more than a vacuum leak or loose fuel cap.

How serious is the P0466 code?

A P0466 code may not affect drivability, but it can cause a vehicle to fail an emissions test.

What repairs can fix the P0466 code?

  • Tightening fuel cap
  • Replacing the fuel cap
  • Replacing vacuum lines or vapor lines
  • Replacing charcoal canister
  • Replacing charcoal canister purge valve and/or solenoid

Additional comments for consideration regarding the P0466 code

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.

Need help with a P0466 code?

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.

trouble codes
P0466
OBD-II

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0466 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,636

Rating Summary
3,315
161
42
24
94
3,315
161
42
24
94

Maxwell

15 years of experience
389 reviews
Maxwell
15 years of experience
Not my first experience with Maxwell, but it was just as good as the last.
2009 AUDI S5 - CHECK ENGINE LIGHT IS ON - CYPRESS, TEXAS

Richard

18 years of experience
169 reviews
Richard
18 years of experience
excellent experience. right on time, explained everything and found the problem in a hurry. highly recommend
2004 VOLKSWAGEN PASSAT - CHECK ENGINE LIGHT IS ON - CAPE CORAL, FLORIDA

Nathan

14 years of experience
95 reviews
Nathan
14 years of experience
Cool guy! Great work!
2011 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - AUSTIN, TEXAS

Tien

20 years of experience
746 reviews
Tien
20 years of experience
Tein was on time, early in fact. He was friendly and personable. Unfortunately the repairs could not be done by him for my immediate problem which was a smog certification. I'm still working on getting that resolved.
2000 MERCEDES-BENZ S430 - CHECK ENGINE LIGHT IS ON - HAYWARD, CALIFORNIA

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...

Related questions

Q: Vehicle turns off at any rpm, at idle or highway speeds, without stumbling or warning.

This kind of a stalling issue can be caused by a variety of problems. They are typically caused by ignition faults, wiring faults, and fuel issues. Although you do not have a Check Engine Light on, you should still scan...

Q: OBD sensor not reading scanner

This sounds like there is no power to the data bus network. This means that the OBD2 plug on your vehicle is not being powered by the battery. I would enlist the help of a qualified technician to find a wiring...

Q: Crank but not start, There is spark and fuel spray in injector, I change the PCM and distributor box but still the same no start

If you are getting spark and fuel to the engine then the only thing left to check is the compression in the engine. Have a compression test done to see if the timing belt may have jumped timing. You should...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com