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Old 03-31-2005, 06:53 PM   #1
Scooby Newbie
Member#: 81770
Join Date: Feb 2005
Location: Orange County, CA
2005 Legacy GT Ltd
Obsidian Black

Default P0171 CEL - Due to tuning?

Today I drove out to lunch, stopped to get some gas and my CEL came on.
I checked it at Autozone and it is a P0171 code.
I don't have a CAI, just the stock airbox. Do you think the error could be attributed to my dyno-tune/reflash last Friday? It is much warmer today and the Santa Anas are blowing. So I don't know if the outside temp or the wind conditions have anything to do with it. I disconnected and reconnected my MAF sensor. I also checked for loose vaccum lines but didn't find any.
So could this be a problem with the Tune and the temperature ?

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Old 03-31-2005, 10:25 PM   #2
Scooby Guru
Member#: 28408
Join Date: Oct 2002
Chapter/Region: TXIC
Location: San Antonio, Tx
2002 vf48ed WRX


it should be because the fuel cant run the AFR you want it to run. the injectors are only able to make a correction of about +-5%. so when they try to tun your AFR and cant do it for whatever reason (leak etc...) then the CEL comes on.

oh and search for a thread about that CEL. lots of good info there.
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