Question about 2002 Toyota Avalon

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AVALON P0174 P0174 SYSTEM TOO LEAN BANK 2 P0440 POWERTRAIN EVAPOTRATIVE EMISSION CONTROL SYSTEM P0441 INCORRECT PURGEFLOW

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Unfortunately, emissions and intake codes like that can mean a huge variety of problems ranging from a bad sensor to a vacuum leak or other random problems. A cheap place to start is to replace your PCV valve, gas cap, and add some injector cleaner like Seafoam or Lucas.

Those are the only likely things that would cause the problem and cost less than the cost of a mechanic's diagnosis, which will run between $50 and $100 to determine it. They will usually perform a smoke test to check for vacuum leaks or use a more complicated scanner than the one you used to get those basic codes.

If you have one of the premium models that shows you the readings of the sensors as well as the trouble codes, you may be able to narrow it down.

Posted on Oct 24, 2012

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Posted on Jan 02, 2017

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jschoon77
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SOURCE: p0440,p0441,p0446

These codes are all for the Evaporative Emissions System.

P0440- Evaporative emissions system fault- just saying there's something wrong with the system.

P0441- Evaporative emissions system- Incorrect purge flow- saying that the system isn't purging the raw fuel vapors (hydrocarbons- HC) as well as it should.

P0446- Evaporative emissions system- Control valve circuit low- there is a valve, usually located on the charcoal canister at the rear of the vehicle, that opens to allow fresh air to enter the evaporative emissions system as the engine vacuum purges the fuel vapors from the charcoal canister and closes when purge is not needed to prevent leakage of those fuel vapors to the atmosphere (HC is a greenhouse gas and is regulated as such by the fed gov't).

Given that you have the incorrect purge flow code and the control valve code together, my bet is that the vent control valve has failed (causing the P0446) and is not opening to allow fresh air into the system to displace the air from within the system that is being pulled to the engine. Since you have no fresh air entering the system, the engine will pull a vacuum on the system instead of the vapors "flowing" into the engine (causing the P0441).


I hope that this is helpful to you!!!


ASE Master Technician with L1 and X1 Certifications; Nissan Scope Technician; Chrysler Level 3 Silver Technician- 12+ years experience.


Posted on Nov 17, 2008

  • 1 Answer

SOURCE: P0440, P0441, P0446

where is Evap Emission Control System Purge Flow fault

Posted on Jul 20, 2009

scottyoung56
  • 89 Answers

SOURCE: 2001 Avalon Check engine codes P0440,p0441 and p0446.

yes it would be a smart thing to do and no it is not that hard it should onlt have two bolts holding it on

Posted on Aug 03, 2009

  • 1861 Answers

SOURCE: engine light on Codes show

Hello! Those three codes commonly indicate the followi possibilities:

The gas cap was not sufficiently tightenend ater fueling, a bad gas-cap rubber o-ring, the vehicle had the key in the 'on', or engine running, or the tank was filed all of the way up the neck.

Any one of the abope causes will set all three codes.

Posted on Dec 21, 2009

  • 67 Answers

SOURCE: Hi, I got 3 codes:

Do a smoke test...

Posted on Mar 10, 2010

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1 Answer

Hello there,my 2001 echo is lighting up trouble codes p0440 p0441 p0446; how and where should i start?


code p0440 refers to evaporative emission (EVAP) system--malfunction=== causes --hose connections --intake leak--EVAP canister purge valve
code po441 refers to EVAP --incorrect flow detected==causes the same as for po440
code po446 refers to EVAP system vent control --circuit malfunction===causes --wiring---EVAP can purge valve--ECM
generally I would replace the purge valve as it is common to all codes

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Code p0440 code p0441 code p0446on toy echo 2000 what is the diagnosis?


P0440 Evaporative Emission Control System Malfunction P0441 Evaporative Emission Control System Incorrect Purge Flow P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
  • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
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  • Inspect for damaged or disconnected hoses around the Evap purge solenoid
  • Check and/or replace the sensor
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Obd ll is comeing up with codes p0174 and p0440


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Failed OBDII Diagnstic trouble codes P0761 and O1744 What does this mean?


code P0761-
Possible causes - Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid 3 valve
- Shift solenoid 3 valve harness or connectors
- Shift solenoid 3 valve circuit is open or shorted
P0761 FORD Description Shift solenoid valve 3 is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position. When is the code detected? The P0761 code is detected when the ECM has detected a mechanical fault with the solenoid energized, valve stuck off code O1744- is not a code these are the ones I have found that come close
P0174 1999 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2000 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2001 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2002 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2003 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 FORD Fuel Injection System Too Lean Bank 2

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Codes P0171, P0174, P0440


This is usually an oxygen sensor, replace the O2 sensor located above the catalytic converter before replacing the evaporator purge canister.

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2005 hyundai santa fe check engine light on... p0171 and p0174 any ideas to repair it.


Definition of P0171 is Applied to All Manufacturers Powertrain: System Too Lean Bank 1
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Nov 03, 2009 | 2005 Hyundai Santa Fe

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1997 toyota camry check engine light on,code po440,po420,po441,


P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

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Mar 29, 2009 | 1997 Toyota Camry

3 Answers

P0440,p0441,p0446


These codes are all for the Evaporative Emissions System.

P0440- Evaporative emissions system fault- just saying there's something wrong with the system.

P0441- Evaporative emissions system- Incorrect purge flow- saying that the system isn't purging the raw fuel vapors (hydrocarbons- HC) as well as it should.

P0446- Evaporative emissions system- Control valve circuit low- there is a valve, usually located on the charcoal canister at the rear of the vehicle, that opens to allow fresh air to enter the evaporative emissions system as the engine vacuum purges the fuel vapors from the charcoal canister and closes when purge is not needed to prevent leakage of those fuel vapors to the atmosphere (HC is a greenhouse gas and is regulated as such by the fed gov't).

Given that you have the incorrect purge flow code and the control valve code together, my bet is that the vent control valve has failed (causing the P0446) and is not opening to allow fresh air into the system to displace the air from within the system that is being pulled to the engine. Since you have no fresh air entering the system, the engine will pull a vacuum on the system instead of the vapors "flowing" into the engine (causing the P0441).


I hope that this is helpful to you!!!


ASE Master Technician with L1 and X1 Certifications; Nissan Scope Technician; Chrysler Level 3 Silver Technician- 12+ years experience.


Nov 17, 2008 | 2001 Toyota Corolla

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