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Vacuum leak error code indicative of small leak what do I do?

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Check all vacuum lines for cracks replace if needed

Posted on Nov 18, 2013

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Check engine light came on while driving..diognostic check showed code of P0171


This is indicating a small vacuum leak. Probably a cracked/broken vacuum hose under the engine cover. Get a good flashlight and start checking around. Let me know what you find.

May 19, 2011 | 1999 Volkswagen Beetle

1 Answer

What is an error code p0442 for a 2001 seabring mean?


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

This 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.

Symptoms: You likely won't notice any drivability problems.

Causes: 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

Possible Solutions: 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


Check it, test it and send us news.

Apr 22, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

Imisions test comes back with, code P1441 ?


P1441 is a EVAP code, small leak I thinking.

P1441 Evaporative Emission (EVAP) System Flow During Non-Purge

Now for the fix: the ECM uses a pressure sensor to watch the system and see that there are no leaks. If it sees a leak via the pressure sensor, it sets this code. The ECM wants to see the pressure sensor voltage drop down, indicating that there is vacuum on the system, and it wants it to be able to hold this vacuum for at least 30 seconds. If this does not happen, it will set a code. As a note, the vent solenoid is the most common failure on these systems.

Hope helps (remember to rate and comment this).

Sep 22, 2010 | 1996 Buick Riviera

1 Answer

Code P 0442 on do ram trucdege 2002


This 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 (most likely)
•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

Feb 21, 2010 | 2004 Audi A4

1 Answer

Somebody checkes with the computer and a code came on thats said troubleshooting p0442


Evaporative emission control system leak detected. (small leak)

This 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

Nov 03, 2009 | 2000 Mitsubishi Eclipse

1 Answer

Error codes p0442 & P0455


Those are both Evaporative Emission Control System related.
442 is a small leak has been detected.
455 is a bigger leak has been detected.
Check all your connections, (electrical & vacuum lines) as well as check for any cracked, loose vacuum hoses in the system, as well as clean "O" ring on your gas cap well and threads in filler pipe & make sure gas cap is tight. Do the gas cap first & see if codes dissappear, but it may take a new gas cap. These codes commonly appear shortly after getting gas, due to cap not back on tight.

Oct 02, 2009 | 2001 Dodge Caravan

1 Answer

2002 Chrysler Town & Country Evaporator leak error code keeps popping up. Does not appear to be loose gas cap


THERE ARE SEVERAL EVAP HOSE LEAK SPOTS ON THESE VEHICLES..UNDER VEHICLE BY EVAP CANISTER,UNDER AIR CLEANER..ALSO LDP VENT VALVE NOT HOLDING VACUUM WILL SET A LEAK CODE..SMALL BLACK VALVE WITH A HOSE ON EACH END WITH A SMALL VACUUM HOSE ON TOP..IT SHOULD HOLD VACUUM WITH HAND HELD VACUUM PUMP..HAVE ALSO SEEN SPLIT HOSES NEAR EVAP SERVICE PORT LOCATED NEXT TO AIR CLEANER HOUSING

Jul 02, 2009 | Chrysler Town & Country Cars & Trucks

2 Answers

Vacuum leak-P0171 2000 Toyota Echo. Need vacuum diagram


A P0171 code does not indicate a vacuum leak; it indicates a dirty mass air flow sensor. This device is located between the air filter box and the intake manifold. Locate it, unplug the wire harness, and remove the 2 screws that holds it onto the intake pipe. Look down inside th sensor, you will see 2 small wires, that are probably covered with fuzzy things...using a spray cleaner, such as brake cleaner, spray the 2 wires until they are clean and shiny. Do NOT use compressed air, that will damage the sensor. When it is clean; reinstall it and drive it. The computer will recognize the now clean sensor, and your troubles will be over.

May 19, 2009 | 2000 Toyota ECHO

1 Answer

TENGO UNA DODGE CARAVAN SPORT 2001 TENGO LOS SIGUIENTES CODIGOS P0442 P0445 P0446 P1684 Y EL PROBLEMA ES QUE MI VAN NO ARRANCA SEGUN EL ESCANER Y LO QUE ME INDICA EN EL TABLERO SON SOLO ESTOS CODIGOS


P0442 refers to a small leak in the Evaporative Emissions System(It purges fuel tank vapors into the engine to be burned rather than vented into the atmosphere). From time to time the PCM pressurizes this system to check its integrity. If it senses a small leak, then it sets this code. 

Is your gas cap on tight? Recheck it.

The evaporative emission system is probed by applying vacuum to the EVAP system and monitoring for a vacuum decay.
 The engine control module (ECM) monitors the vacuum level through the fuel tank pressure sensor signal.

The EVAP canister purge valve and the EVAP vent solenoid are turned on at the nick of time, allowing the engine to **** up a small vacuum on the entire EVAP system.

 After the requisite vacuum level has been obtained, the EVAP canister purge valve is switched OFF, locking the system entirely.

 If sufficient vacuum level cannot be derived, a large leak is indicated. This can be caused by the following conditions 


The P1684 code simply means that the battery has been disconneted within the last 50 starts.

Your Car has a Lot of Problems, but some not at all expensive to fix

Apr 24, 2009 | 2002 Chrysler Sebring

2 Answers

Check engine light on DTC P0456


P0456 is a code set when there is a very small leak (theres very small leak, small leak and a couple of others, your code indicates the smallest level of leaking). This can be caused by a vacuum line that is cracked or otherwise leaking on the evaporative (EVAP) system. It could even be from a gas cap that is not sealing properly, though typically a gas cap leak tends to set code P0441. Just the same, and since it is the cheaper way to go, start by replacing the gas cap and see if that clears the code and any check engine light you may have.

Once you replace the gas cap you may need to disconnect the battery for a couple minutes to reset everything if you dont have access to a scanner that can do it.

Jan 01, 2009 | 2004 Kia Amanti

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