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Po456 code - 2007 Chrysler 300 AWD Sedan

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Gas cap or evap hose is leaking.

Posted on May 08, 2014

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Posted on Jan 02, 2017

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PO456 Code Replaced gas cap and bad filler neck (rusted). Purge valve has loose components rattling when I tap on it.


It is impossible to answer your question without knowing the YEAR, MAKE, and MODEL of your vehicle.
That being said, on almost all vehicles, the purge valve is an easily-replaceable part. If you are not able to find the EXACT purge valve for your vehicle, find something that will fit in its place (they all work the same).

May 22, 2015 | Cars & Trucks

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I have a Dodge Ram F1500 engine light came on code is po456 and po457 were can I find out what that is so I can fix the problem


po456 evaporative control small leak

p0457 EVAP System Leak Detected/Fuel Fill Cap Loose Or Missing

Sep 07, 2013 | Dodge Ram 1500 Cars & Trucks

1 Answer

Codes0441 0442 0455 0456


codes po441 po442 po455 po456. code po441 - EVAP system no flow during purge conditions.code po442 -EVAP system small leak detected conditions. code po455 - EVAP system large leak detected conditions.code po456 - EVAP system very small leak detected. possible causes loose damaged missing fuel cap.fuel tank sensor disconnected or failed. ORING on top fuel sending unit leaking.purge valve vapor line clogged disconnected or purge solenoid failed.vent solenoid not closing or has failed.

May 23, 2013 | 2002 Dodge Durango

1 Answer

What does the code po456 mean?


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

Jan 08, 2013 | 2005 Ford Focus

1 Answer

Code po456


this is the code table: code table
hope it can help you and good luck

Nov 12, 2012 | 2005 Chrysler Sebring Convertible

1 Answer

I have a obd code of PO456 for a 2003 dodge Durango.Do you know what that would be.


When you get the code,find out what it is,or buy a code reader and a book of codes

PO456 EVAP Contol System Leak (Very Small) 0.508mm (0.020 inch)

Gas Cap
Holes or cuts in fuel vapor hoses
Loose hoses
Evap Component failures
Vent solenoid open
Canister Purge Valve,issues

And on and on


Have a smoke machine put on the system and repaired

Nov 05, 2010 | Dodge Durango Cars & Trucks

2 Answers

PO456 code on 2002 Jeep Wrangler.Where do I start?


p0456 is ayoun evap fault honestly this is a job for a professional with the correct diagnostic equipment jsut from memory it is a vent control fault. if you have access to alldata or mitchel on demand you can get diagnostic steps for the proper diagnosis. unless you have the proper tools this is a job left to a good repair technician that you trust sorry i cant give you a straight answer but you will throw away money buy just replacing parts and hoping it fixes it, just food for thought if the code is cleared it will take time to come back the only way to conferm the repair is a evap self test that can be done with the adiquite scan tool

Nov 12, 2009 | 2002 Jeep Wrangler

1 Answer

Volvo s70 glt po456 442 301


I believe the PO456,PO442 are evap conserns The PO301 is a miss fire on cylinder #1

Aug 26, 2009 | 2000 Volvo S70

1 Answer

Trouble code po456 evap small leak ? could it be the gas cap ?


Can't say 100% obviously, but quite often that is the cure, but try to take some time to make sure all your hoses , in the system are in good shape & tight.

May 31, 2009 | 2002 Dodge Grand Caravan

1 Answer

Check engine light code PO456


most likely the pressure sensor in the fuel tank for the evap system is defective.

Feb 25, 2009 | 2004 Jeep Wrangler

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