Question about 1999 Ford Taurus

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Emission evaporative system large leak

Receiving message of emission evaporative system large leak on tester. Check engine light is on.

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  • Anonymous Mar 29, 2014

    Check engine light on

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Error messages like this are typically caused by air leaks at one of several key places: (1) at the gas tank filler neck; (2) at the charcoal canister; or (3) one of the larger vacuum hoses under your hood.

A loose hose is probably the most common problem--over time, the plastic nipples to which those hoses attach weaken and can break off. Thus, a hose can look like it's in the right place, but it's not actually creating a seal at one end.

You can try to listen for this with the engine running and the hood open. Do you hear any kind of a "hissing" sound like you might hear when using one of those spittoon-things at the dentist? That's a major vacuum leak, right there. Many leaks aren't noisy enough to hear over the sound of the engine, though, so don't consider an absence of noise a statement that everything is just OK down there.

The problem at the fuel filler neck was endemic to certain GM vehicles, but it appears in other cars, too. Believe it or not, there's a vapor recovery hose that is attached at some point of the fuel filler neck to catch evaporation off the tank. Some cars also have another pickup right at the top of the gas tank, too. If one of these has worked loose or rotted, you'll start getting strange vacuum readings and a check engine light.

Hope this helps. Finding the cause of this problem usually takes more time (and money) than the actual fix.

Good luck!

Posted on Dec 02, 2012

6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

mas66
  • 104 Answers

SOURCE: 2002 escape check engine light

The most common fault that Escape has with emission control is the EGR pressure sensor failing. The code for this is p0704 (from memory) and if this the the code you have then i recommend replacing that part first. This would not effect the cold start performance however, I would suggest that this is a separate issue. Recommend having the throttle body cleaned and the idle reset to help cold start issue.
Hope this helps, Mark.

Posted on Dec 03, 2008

chuck943
  • 783 Answers

SOURCE: what P0453-Evaporative Emission control System Pressure Sensor h

P0453 is for the fuel tank pressure sensor. This code means that the voltage on the sensor was greater than 4.5V during key on engine off or during any engine operating mode.
Normal voltage from this sensor with no vacuum or pressure on the system should be 2.37 to 2.97V.
PCM sends a reference voltage of 5V to the sensor and tells if there is pressure or vacuum in the fuel tank by the voltage that returns from the sensor.

Possible causes are:

  • FTP circuit open
  • VREF shorted to VPWR
  • Damaged PCM
  • FTP circuit shorted to VREF or VPWR
  • SIG RTN circuit open
  • Damaged FTP sensor

  • Usually it is a loose connector at the sensor or a bad sensor.
    It mounts on top of the fuel tank,has a 3 wire connector. To replace it you have to push down on it and twist,if I remember right CC.

    Posted on Mar 10, 2009

    • 29 Answers

    SOURCE: engine light -on . did scann with obd 2 scanner.

    This code is refering to an area close to where you fill your gas tank. There is a box back there that has a job of capturing the gas vapors from your gas tank the computer in your car has found a problem in that system but it would depend on what the code said (small leak ) would be the evap box has a leak. If the code said (gross leak) it is a loose gas cap or bad gas cap . If it is the evap box you will need to have a shop hook up a smoke machine to find the leak

    Posted on Mar 23, 2009

    • 218 Answers

    SOURCE: code P0442-evaporated emissions control system leak.what does this mean,and how do i fix this problem on my 1998 ford explorer.

    NUMEROUS THIS CAQN CAUSE THAT LEAK.U NEED TO FIL THE SYSTEM W/ A SKOKE MACHINE AND FIND THE LEAK WHERE SMOKE IS COMMING OUT.GOOD JOB FOR A SHOP

    Posted on May 07, 2009

    • 27 Answers

    SOURCE: Check Engine Light

    check ur plugs if coolant got in the plug hole were the coil goes it set the light pull the plug n coil n dry them

    Posted on May 25, 2009

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    You should have an EVAP leak test done . It could be a leaking purge valve , you could need a new gas cap as well or it could be the fuel filler neck . or assorted hoses or the fuel tank pressure sensor . If the check engine light is lit there will be a code .
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    NOPE CANT ERASE CODES UNTIL THE PROBLEM IS FIXED OR THE SERVICE ENGINE LIGHT SOON WILL STAY ON. CODE PO441 - EVAPORATIVE EMISSION EVAP SYSTEM INCORRECT FLOW DETECTED.CHECK INTAKE VACUUM HOSE CONNECTIONS AT THE EVAP CANISTER PURGE VALVE.IF ALL IS GOOD.THE EVAP CANISTER PURGE VALVE COULD BE BAD. CODE PO 442 - EVAPORATIVE EMISSION EVAP SYSTEM SMALL LEAK DETECTED. EVAPORATIVE EMISSION SYSTEM LARGE LEAK DETECTED FUEL CAP LOOSE OR OFF MISSING. CODE PO 446 - EVAPORATIVE EMISSION EVAP SYSTEM VENT CONTROL CIRCUIT MALFUNCTION.

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    The best thing is to take it and have it checked out, they might have to do a smoke test to find the problem.
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    I checked the codes and one comes up its po446. i dont under stand what it mean so i cant fix it to get the light to go out.


    P0446 Evaporative Emission System Vent Control Circuit.
    The following are descriptions of all Evaporative possible codes:

    P0441 Evaporative Emission System Incorrect Purge Flow
    P0442 Evaporative Emission System Leak Detected (small leak)
    P0443 Evaporative Emission System Purge Control Valve Circuit
    P0444 Evaporative Emission System Purge Control Valve Circuit Open
    P0445 Evaporative Emission System Purge Control Valve Circuit Shorted
    P0446 Evaporative Emission System Vent Control Circuit
    P0447 Evaporative Emission System Vent Control Circuit Open
    P0448 Evaporative Emission System Vent Control Circuit Shorted
    P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
    P0450 Evaporative Emission System Pressure Sensor/Switch
    P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance
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    P0453 Evaporative Emission System Pressure Sensor/Switch High
    P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent
    P0455 Evaporative Emission System Leak Detected (large leak)
    P0456 Evaporative Emission System Leak Detected (very small leak)
    P0457 Evaporative Emission System Leak Detected (fuel cap loose/off)
    P0458 Evaporative Emission System Purge Control Valve Circuit Low
    P0459 Evaporative Emission System Purge Control Valve Circuit High
    ---
    At least the cap isn't loose for the gas tank.

    I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.

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    I have a 2002 Ford Taurus, and an engine sign showed up. However, I pulled out the code which is P0442. what is the problem, how much would that cost me and when do I need to fix it, can I wait for the...


    P0442 code relating to the EVAP (Evaporative Emission System).a small emissions leak. also check the gas cap .Try cleaning the seals first and then try putting a little vaseline on the seals before getting a new gas cap. -------------
    Code P0442-Evaporative emission control system. Canister Purge system failed the monitor test indicating a large leak (over 0.040”). Enabling conditions: Engine running after a 6 to 8 hour engine off period called a cold soak. The test runs when engine load is between 15 to 45% and inlet air temperature between 40 and 130°F. Blocking Action: This code can block the following monitors: Fuel Control, O2 monitor, Catalyst Monitor, misfire monitor. Testing: Check the purge hoses for leaks, leaking vapor management valve or loose gas cap.

    This simply indicates that there was no flow from the evap system when the purge valve was energized. This could be cause of a few different reasons. First, check for leaks by visually looking at all evap lines for cranks rips or any tears. Basically, anywhere that fuel vapors can escape.
    ----------- Here is the test that will smoke the system for leaks with a smoke machine.

    Evaporative Emission System Leak Test

    SPECIAL TOOL(S)

    CAUTION: The evaporative emission system must not be pressurized to more than 3.48 kPa (14 inches H2O)or damage to the evaporative emission system may occur.
    1. Connect the Evaporative Emission System Leak Tester to the evaporative emission test port.
    2. Close the canister vent solenoid.
    3. Pressurize the evaporative emission system to 3.48 kPa (14 inches H2O) .
    4. Monitor the system for two minutes . The system fails the leak test if the pressure falls below 2.0 kPa (8 inches H2O) .
    5. Repair any leaks as necessary.
    6. Repeat the leak test until the system remains above 2.0 kPa (8 inches H2O) after the two-minute test period.
    ---------- get it repaired ASAP because if you drive the car in same condition the emisson system can get damaged.and code will be p0445 ,now the code is p0442 its for leak in the emisson system. ---------------- This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

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    1 Answer

    Check engine light is on for emission evaporator failure-large


    P0455 - EVAP Control System Leak Detected (No Purge Flow or Large Leak) The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).
    • After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
    • Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube
    • EVAP canister purge valve stuck closed
    • Damaged EVAP canister
    • Damaged or missing fuel filler cap
    • Insufficient fuel filler cap installation
    • Loose fuel vapor hose/tube connections to EVAP system components
    • Blockages or restrictions in fuel vapor hoses/tubes (items also listed under disconnections or cracks)
    • Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked
    • Canister vent (CV) solenoid stuck open
    • Mechanically inoperative fuel tank pressure (FTP) sensor
    Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank. ----------------------------------------------------------------------------- HX43 DTC P0457: CHECK FOR MISSING OR LEAKING FUEL FILLER CAP
    • Check for missing fuel filler cap.
    • Check for loose fuel filler cap.
    • Check for possible cross-thread fuel filler cap condition.
    Is a fault present concerning the proper installation of the fuel filler cap? Yes No REPLACE cross-threaded or damaged fuel filler cap. RECONNECT and TIGHTEN the fuel filler cap only one eighth turn so that the cap initially clicks by sound or touch. CLEAR Continuous Memory DTCs. COMPLETE an Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle (refer to Section 2 , Drive Cycles). RERUN Quick Test . If DTC P0455 or P0457 is present, Go to HX44 . CLEAR Continuous Memory DTCs. COMPLETE an Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle (refer to Section 2 , Drive Cycles). RERUN Quick Test .

    For DTC P0455 still present: Go to HX44 .

    Otherwise, INFORM the vehicle owner that it is important and necessary to immediately install the fuel filler cap after every refueling event. HX44 DTC P0455: VISUAL INSPECTION FOR SUBSTANTIAL EVAPORATIVE EMISSION SYSTEM LEAKS
    • Check for missing fuel filler cap. If the cap is loose DO NOT DISTURB EVAP system.
    • Verify that both the input port vacuum hose and EVAP return tube are attached to the EVAP canister purge valve. Note: If the EVAP canister-CV solenoid assembly is not accessible during this pinpoint test step, GO to Evaporative Emissions, Section 303-13 in the Workshop Manual for removal and installation instructions.
    • Verify that the CV solenoid is properly seated on the EVAP canister (if possible).
    • Visually inspect for disconnected or cracked fuel vapor hoses/tubes between the intake manifold, the EVAP canister purge valve, the EVAP canister, the fuel vapor vent valve assembly and if applicable the fuel vapor control valve tube assembly.
    • Check for damage to the fuel filler pipe and the fuel tank.
    Is a fault indicated? Yes No CONNECT or REPLACE fuel vapor hoses/tubes as required. REPLACE damaged EVAP system components (fuel filler pipe, fuel vapor vent valve assembly, fuel vapor control valve tube assembly, EVAP canister purge valve, FTP sensor and EVAP canister-CV solenoid assembly) as necessary. REFER to Evaporative Emissions, Section 303-13 in the Workshop Manual for removal and installation instructions. GO to HX45 . GO to HX45 . HX45 DTC P1443 and P0455: CHECK FOR EVAPORATIVE EMISSION SYSTEM LEAKS
      Note: When checking for leaks or blockages in the EVAP system, energize (close) the canister vent (CV) solenoid through the scan tool for a maximum of nine minutes per pinpoint test step. Then de-energize the CV solenoid prior to performing the subsequent pinpoint test step. This is done to assure proper closing of the solenoid.
    • Disconnect and plug the EVAP return tube (EVAP canister purge valve to intake manifold) at the intake manifold vacuum source.
    • Connect scan tool.
    • Key on, engine off.
    • Access VPWR PID. If the voltage is not 12 volts or greater, GO to HX61 .
    • Locate evaporative test port [marked EVAPORATIVE SERVICE PORT DO NOT USE UNREGULATED PRESSURE ABOVE 6.89 kPa (1 PSI)] near EVAP canister purge valve or EVAP canister.
    • If vehicle is not equipped with the evaporative test port, GO to HX50 .
    • Install the Rotunda Evaporative Emission System Leak Tester 310-F007 (134-00056) or equivalent at the evaporative test port.
    • Close CV solenoid by accessing Output Test Mode on the scan tool.
    • Select ALL OFF mode and push START button.
    • Regulate the nitrogen or argon gas pressure on the tester to 3.48 kPa (14 in-H 2 O).
    • Follow the instructions that come with the EVAP System Leak Tester and pressurize the EVAP system.
    • Perform the EVAP system leak test.
    Does the pressure on the EVAP system stay above 1.99 kPa (8 in-H 2 O) and pass the leak test? Yes No GO to HX46 . REMOVE the EVAP System Leak Tester from the evaporative test port and REINSTALL the test port cap. GO to HX50 .

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