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Old 11-21-2012, 01:33 PM   #1
Scooby Specialist
Member#: 315546
Join Date: Apr 2012
Location: nova
03 wrx

Default Check engine Code P0457?

This recently came on after replacing both gaskets for uppipe, any advice on where to start looking?
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Old 11-21-2012, 01:36 PM   #2
Medium Frank
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
2014 Porsche
GT3 (Currently on Fire)


Moved to your specific powertrain forum.

Could be as simple as a loose gas cap or something more complicated. Up pipe has nothing to do with this code.
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Old 11-21-2012, 02:27 PM   #3
Mr Wrex
Scooby Specialist
Member#: 332887
Join Date: Sep 2012
Chapter/Region: Tri-State
Location: Orange County, NY
2012 WRX stage 2+
DGM (sedan)


Do you smell gas fumes at all? Check for things like an open evap hose, loose gas cap, or the gas cap o-ring.

I probably won't be checking this thread again if you do happen to reply to it, so I'll just list more specific causes under this CEL code... check your drain valve (also known as a "canister vent valve"), check the hoses behind your alternator (you may have tugged one off while lifting the engine, if you did that is...), or maybe check the canister's purge solenoid. Hopefully it's something stupid like your gas cap being screwy, but it's probably related to the evap system. If you can't figure it out, bring it to a mechanic. Best of luck.

Last edited by Mr Wrex; 11-21-2012 at 04:08 PM.
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Old 11-21-2012, 09:17 PM   #4
Scooby Specialist
Member#: 131280
Join Date: Nov 2006
Chapter/Region: BAIC
Location: Northern California Hayward
2004 Impreza WRX


If not the gas cap. Check the evap canister and or the evap solenoid.
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Old 11-22-2012, 12:32 AM   #5
Scooby Specialist
Member#: 118086
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: The land of BEER and Cheese
2003 WRX


Check the evap solenoid by the charcoal can. Unplug it & put 12 volts to the solenoid if it dose not click then you found your problum
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Old 11-22-2012, 08:42 AM   #6
Scooby Guru
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va

Type "P0457" into the search box and read the decades worth of causes and solutions......
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