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Code reads PO442 ( small emission leak ) do you know the codes meaning ?

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Posted on Jan 02, 2017

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SOURCE: 2003 ford freestar what does trouble code po442

Hello syatzus.
This is the most common code we see in my repair shop.
The description of this code is "small leak detected-evaporative system".
The reason for it all is emissions. In vehicles produced in the last several years there is a system in them that is capable of storing gasoline vapors (hydrocarbons). When filling your fuel tank vapors are now directed to a vapor storage device called a carbon canister. When driving your car under certain driving conditions these vapors are drawn into the engine to be burned.
So in order to get the vapors into the canister the fuel system must be sealed. So the systems in vehicles will sometimes run a test to verify that the system stays sealed, if it doesn't, your check engine light comes on.
A loose fuel cap can do this, but so can a rusted line, a bad solenoid, cracked carbon canister and so on.
One of the best ways to locate a leak that isn't obvious is to use a smoke generating devise and introduce it into the evap system.
Many good shops will have a smoke machine today. If they don't I am sure they pull their hair out trying to fix this code.
I hope yours is a simple fix.

Posted on Nov 24, 2009

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SOURCE: My taurus failed due to code p0442 ecap emiss ctl sys leak detected (small leak)

    Continuous Memory Diagnostic Trouble Code (DTC) P0442 indicates that a fuel vapor leak has been detected [as small as 0.10 cm (0.04 inch)] in the Evaporative Emission (EVAP) system.
    Note: Prior to performing the following diagnosis inspect the Canister Vent Solenoid (CV) for contamination. A situation may exist where contamination holds open the Canister Vent (CV) solenoid enough to set DTC P0442 and also plugs the port to atmosphere enough to keep system from being vented quickly.
    • After market parts and accessories nonconforming to the EVAP system specifications.
    • Damaged, cross threaded or loosely installed fuel filler cap.
    • Small holes or cuts in fuel vapor hoses/tubes (EVAP canister tube, EVAP canister outlet tube or EVAP return tube) in the EVAP system.
    • Loose fuel vapor hose/tube connections to EVAP system components.
    • EVAP system component [EVAP canister purge valve, fuel tank pressure (FTP) sensor, canister vent (CV) solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly] seals leaking.
    • CV solenoid partially open when commanded closed.
    • EVAP canister leaking.
  • Check for presence of fuel filler cap.
  • Verify that the CV solenoid is properly seated on the EVAP canister (if possible).
  • Visually inspect for cut or loose connections to fuel vapor hoses/tubes in following locations:
    • EVAP canister to EVAP canister purge valve.
    • EVAP canister to fuel vapor vent valve assembly.
    • fuel vapor control valve tube assembly to fuel tank (if applicable).

Posted on Jul 26, 2008

  • 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

SOURCE: Engine Light codes PO743, PO750,

www.engine-light-help.com/generic-check-engine-light-codes.html

Posted on Feb 26, 2011

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2 Answers

Po442 code reader


no nothing to do with transmission ---its an evap code small leak detected this is the usual check gas cap that its on and tight or replace because seal is shot but the following link explains the other problems with assistance in helping repair problem
http://www.obd-codes.com/p0442

Jul 25, 2016 | 2000 Honda Passport

1 Answer

2002 Buick Regal Service Engine Soon light PO442 diagnostic code


That is an emissions code. It means you have a small leak in one of the lines. Most likely it the line that goes from the engine to the evap canister in the drivers side rear inner fender well.

Mar 01, 2015 | 2002 Buick Regal

1 Answer

PO442


code p0442 refers to evaporative emission (EVAP) system--small leak detected====causes hose connection/s---intake leak--EVAP canister---EVAP canister purge valve
it also refers to evaporative emission system --large leak detected (fuel cap loose/ off)===causes---mechanical fault--hose connection/s--EVAP pressure sensor.

Jun 14, 2014 | 2003 Toyota ECHO

1 Answer

2000 dodge dakota code PO442 problems and solutions


The P0442 means Evaporative Emission Control System Leak Detected (small leak)
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ktag ecu programming tool

Oct 22, 2012 | Cars & Trucks

1 Answer

What does PO442 and PO463 codes mean


PO442 indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.A code P0442 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal
With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses
P0463 Fuel Level Sensor Circuit High Voltage

Jan 26, 2012 | 2002 Cadillac Deville

1 Answer

Diagnostic codes PO442, PO305 and PO455 comes up on the computer. What do these codes mean?


P0305....Cylinder 5 Misfire Detected


P0442....Evaporative Emission Control System Leak Detected (small leak)


P0455....Evaporative Emission Control System Leak Detected (gross leak)

Feb 11, 2011 | 2001 Dodge Caravan

1 Answer

What does codes po442,po442pd and po742 mean


po442= evap emission control system leak (small)
po742= torque converter clutch soleniod circuit stuck on
i got these out of the booklet for my code reader po442pd wasn't listed

May 08, 2010 | 1999 Chevrolet Lumina

1 Answer

My check engine light on my 2001 hyundai accent gl reads code po441, po442. What does these codes mean?


Most of the time they mean:
p0441 = Evaporative Emission System Incorrect Purge Flow
p0422 =
Evaporative Emission Control System Leak Detected (small leak)

MOre info at http://www.obd-codes.com/p0442

Jan 10, 2010 | 2001 Hyundai Accent

1 Answer

Failed Emision test


po442 is evap emission control system leak (small) 1 of the lines for emissions is leaking. po455 is-- emission control system leak (large). turn off light with code scanner after it is fixed.

Sep 01, 2009 | 2001 Dodge Caravan

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