Question about 2003 Jeep Liberty

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PO455 odb scan code evap. system large leak. 2003 jeep liberty sport 42,000 miles Where do I start to shoot the problem

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You need a smoke machine to fill evap sysytem and it will leak smoke out where the leak is to many tight places to look without

Posted on Sep 26, 2009

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Posted on Jan 02, 2017

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Code po455


Code 455 means there is a large leak in the evap system. The evap system is how the computer vents the gas tank to the vapor canister. The system would need to be pressure tested.

Jul 16, 2014 | 2009 Nissan Versa

1 Answer

Why is my 2010 ford fusion is throwing code po455. no gas cap required


P0455 is Evaporative Emissions System Leak Detected (Large) and means that there is a large leak in the system probably with one of the EVAP hoses near the fuel tank or EVAP canister or maybe even A leaky purge valve.

May 06, 2014 | Ford Fusion 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

Pulled a po455 code


jeep uses whats called a leak detection pump that is the most common failure in the system that i have seen in the last five yeas

Jul 07, 2012 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Troubleshoot codes


po442 evap system small leak po455 evap system large leak po456 evap system very small leak. the evap system is located under the driverside of van. from all indication you have a hole in a line or a bad connection on one of the lines. inspect and repair.

Mar 27, 2010 | 2003 Dodge Grand Caravan AWD

1 Answer

2003 Jeep Liberty


p0455 is evap control system no purge or large leak
p0442 is evap control system leak detected (small leak)

the cause for both could actually be a loose gas cap.

Dec 18, 2009 | 2002 Jeep Grand Cherokee

2 Answers

I have trouble starting my 2002 Jeep Liberty plus I have error codes P0442 &P0455. What is wrong? and how can I fix.


PO442 & PO455 are for your evap system which has to do with monitoring your fuel tank and fuel vapor system this shouldn't affect starting at all.

Oct 11, 2009 | 2008 Land Rover Range Rover Sport

1 Answer

Po455 jeep grand cherokee laredo 2003


that code is for a large evap leak.

that system is how the gas tank vents itself so the vapor/fumes don't go into the air.

most common cause is refilling while the truck is running and the second most common is a bad gas cap.

now if you go to auto zone and get it cleared and while you are there buy a new gas cap. and the code comes back on after you did that then you will have to find the leak and will involve some intencive trouble shooting.

if you have any ore question please ask.

Sep 26, 2009 | 2003 Jeep Grand Cherokee

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

4 Answers

Engine dies, starts rough


Most large parts stores read codes free. Most common cause is crank sensor, but I'd have code checked before buying anything.

May 27, 2009 | 2003 Jeep Liberty

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