Question about 2004 Mercury Mountaineer

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

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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

Posted on May 09, 2010

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Code po 441 2004 Kia


Check the fuel cap or vent valve if you have a smoke machine you can close vent valve with a bi directional scanner and smoke the system if leak appears though charcol canister with vent valve close the vent valve is the problem.
Fuel tank should have a certain amount of vac in hg that is monitered by pcm of vac is low or has none the it will trigger check engine light on 2nd ignition cycle

Jan 22, 2015 | Kia Cars & Trucks

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Engine light came on hooked up the digital OBD two car reader and it says PO 456


Code 456 is for a small leak found in the EVAP system. It could be a faulty gas cap, or something else.

Jan 31, 2014 | 2004 Jeep Wrangler

1 Answer

Mil light


Here's a link to it,best to check the canister and hoses.Gas cap could be leaking.

Dec 12, 2013 | 2003 Nissan Pathfinder

1 Answer

Engine codes PO 128, PO 440, PO 456 and PO 622


Trouble Code: P0128

Thermostat Rationality Test

Possible Causes:


Check the operation of the thermostat (it may be stuck open).ECT Sensor is contaminated, damaged or it has failed.Inspect for low coolant level or for an incorrect coolant mixture.Trouble Code: P0440

EVAP Purge System Fault

Possible Causes:


EVAP purge valve vacuum supply is leaking or clogged.EVAP purge valve is stuck closed.EVAP purge solenoid has failed.NVLD assembly (leak detection) is damaged or has failed.NVLD switch circuit is open or the NVLD switch has failed.Ground circuit is open.PCM has failed.Trouble Code: P0456

EVAP Small Leak (0.020") Detected

Possible Causes:


.EVAP fuel tank or canister vapor hoses leaking or damaged.EVAP system component leaking, fuel cap loose or missing.Leak detection pump damaged or leaking.Trouble Code: P0622

Generator Field Control Circuit Malfunction

Possible Causes:


Generator field control circuit is open or is shorted to ground.Generator field control circuit is shorted to system power (B+).Generator field ground circuit is open.Generator is damaged or PCM has failed.PCM has failed.Here are the codes and causes.

Nov 25, 2012 | 2002 Dodge Intrepid

1 Answer

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

04 dodge ram pickup has code po 456 what is this code? 04 dodge ram 1500 5.7 engine gas mileage has gotten worse.


Small leak in evaporative emissions system. Basically takes fuel vapors and recirculates them back to engine to be burned rather than vented into the atmosphere.One common cause of light on dash is faulty/dirty gas cap seal. Did you add fuel just before light came on? Otherwise a small leak at a hose etc., in system, as well as faulty purge system may also cause it.

Nov 05, 2011 | 2006 Dodge Ram 1500

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

Jun 08, 2010 | 2006 Chrysler PT Cruiser

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

Feb 13, 2010 | 2007 Honda Pilot

3 Answers

Engine light on mercury mountaineer code PO 174 PO 171 how do i fix it......


mass air flow sensor & the PVC assembly needs to be replaced

Jan 16, 2010 | 1998 Mercury Mountaineer

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