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P0171 system too lean(bank 1)

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Old 03 March 2015, 12:28 PM
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snedz21
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Default P0171 system too lean(bank 1)

hey lookin for some help with this problem, I was told replacing the front lambda sensor would cure this but it hasn't, I bought a brand new dendo sensor, other things I have done is replace and clean the maf, the problems I have is the car is hesitant on pull and the boost is rough, and dosent reach full boost, any help appreciated thanks
Old 05 March 2015, 02:25 PM
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porter555
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Hi, i had this code recently on my newly brought '53' blob eye sti. The previous owner had fitted an cheapo atmospheric dump valve. As soon as i reverted it back to a standard recirculating valve the code hasnt come back.
May not be of help, but if you have an atmospheric valve fitted, might be worth getting rid of.
Cheers
Old 05 March 2015, 07:28 PM
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johnny subaru
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That is a very common fault code and could be lots of things.

A good read on it here.

http://forums.nasioc.com/forums/show...=475620&page=3


Had the same code on my bugeye sti and it went away shortly after i changed the spark plugs.

A couple of the old plugs were not screwed in tight enough which may have been the issue.
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