I have a 2005 liberty the check engine light came on...I used the code reader and it came up with a OB 457....Does anyone know what that code means...I cant seem to find it anywhere...

Thanks Bob

Code P0457=EVAP Emission control system leak Cap loose/off.Check your gas cap,make sure it's tight(3 clicks).

Thanks....Ithought 456 was gas cap trouble....Cranked on gas cap and reset code..Sof far so good.

Code P0456 is evap small leak,both can be caused by a loose gas cap but P0457 is specific for the gas cap and P0456 could be a number of things(pin hole in a evap hose,small hole in canister,ect).

Forgive for reviving a long dead posting but I have questions regarding this particular engine code on my 04 Liberty Sport.

After just replacing two O2 sensors because of engine codes 157 & 137 I am greeting with yet another engine code; 456.
Could these be related?


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my trail & highway ride (and occasional tow rig)
04 Liberty Sport with a 2.5" lift, ProComp 245/75R16 AT's and two Hella700FF lamps (more accessories to come)

my trail queen
95 YJ with a RE 4" lift, 33" ProComp Extreme's, M8000 Winch, Lockrite Locker up front, Super35 in the rear and 4.88 gears