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456 ENGINE CODE SOLUTIONS PLEASE - 2004 Dodge Caravan

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  • yadayada
    yadayada May 11, 2010

    456 is not a valid code

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P0456 (Very Small EVAP Leak)
Check the filler tube gromet/seal located on the fuel tank itself. The tank also carries caps on the tank. The fuel doesn't need to leak out it evaporates and vehicle is able to detect a leak.
hope this is of some help....please leave feedback if it is,....many thanx

Posted on Sep 03, 2009

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Posted on Jan 02, 2017

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Engine light on in 2005 jeep liberty, code p0456


Code 456 is a common code for a small leak in the evap system. The evap system is how the computer vents gas fumes from the gas tank.
The problem could be a faulty gas cap, the cap left off with the engine running, or something else.

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Code P0456 on an Audi is an Evaporative System Emission Leak. You can find more detail here

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Code po456 what is the problem


The generic description for code 456 is a small or large leak in the EVAP system. The computer vents the gas tank to the vapor canister when the engine is running. It also checks the system for leaks.
The gas tank would need to be pressure tested for leaks, including the gas cap.

Jun 21, 2013 | 2008 Suzuki SX4

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Trouble shooting a 456 code on a 2002 subaru legacy


Evaporative emission control system malfunction
Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:
  • A small leak in any of the EVAP hoses or fuel tank hoses
  • A small leak in the purge valve or vent valve
  • The EVAP Canister may be leaking

Oct 17, 2012 | Cars & Trucks

1 Answer

Error Code PO 456


vacuum leak in the evaporative emission system hard one to solve without the vehicle but could be as easy as a loose or faulty fuel cap just think the fuel tank breaths as well

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Engine light on faults p 456 p522


P0456 is Evap Emission control small leak detected.
P0522 Engine oil pressure sensor low voltage.
The first code could be related to a loose, defective, or missing gas cap.
The second code, could be a defective sensor but you will need to confirm. Check oil level and condition first then onto the sensor and related wiring.

May 13, 2010 | 2006 Dodge Grand Caravan

1 Answer

2004 mountaineer code po 456 came up service engine light on. fuel cap replaced. still on.


the gas cap is the most common if u can reset code do so and if code comes back then need to check-- the fuel lines -purge valve and vent -also the canister--- for cracked disconnected damaged lines

May 09, 2010 | 2004 Mercury Mountaineer

1 Answer

Engine light came on, car is hard to start. Just downloaded the codes and it shows 404 and 456. What part do I need to replace?


404 is an EGR code
and 456 is gas leak

So probably tighten gas cap or replace gas cap for code 456 then for code 404 clean carbon deposits from EGR valve or replace it then e mail me for a certain test that has to be done at sj196653@yahoo.com thanks

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1 Answer

Engine code 456


Evaporative Emissions System - Small leak detected

Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivably cause this code as well or if the cap wasn't properly tightened.

Any of the following could also be the cause:
  • A small leak in any of the EVAP hoses or fuel tank hoses
  • A small leak in the purge valve or vent valve
  • The EVAP Canister may be leaking
Solutions...
First, using a scan tool activate the vent solenoid, sealing the system. Then monitor the fuel tank pressure (FTP) sensor. If the system is sealing properly, the number will stay consistent. If is isn't, the pressure sensor will show that as well. If the system slowly leaks, use a smoke machine and watch for smoke exiting the system at any EVAP component. Any where there is smoke exiting the system, that is the faulty component. Do not pressurize the EVAP system with air pressure. Doing so can damage the purge and vent solenoids in the system.

Oct 30, 2009 | 2002 Chrysler Town & Country

1 Answer

03 JGC losses power engine light blinks


I would start with a test drive with a fuel pressure gauge on it make sure you have spec. 35 - 40 psi. Clear codes and record all the freeze frame data in obd2 as you will need this in the diag process. 442 and 456 are evap codes I believe, do they return with the 300 misfire codes? Either way you need to reproduce the problem with the gauge on it and get the first code it sets. Could be fuel pump/filter/sending unit assy. In this case you will need to pay attention to the fuel level when this occurs. (same level as before)

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