Running Lean
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This is a discussion on Running Lean within the Maintenance, service, and repair forums, part of the Tutorials & DIY category; I have an '02 WRX. My friend put a rather large K&N air filter on it. Now the 'Check Engine' ...

  1. #1
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    Jun 2003
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    Running Lean

    I have an '02 WRX. My friend put a rather large K&N air filter on it. Now the 'Check Engine' light is on, and it will stall if I give it a lot of gas and then take it out of gear. Subaru Service told me it's code PO171 (system too lean). I'm assuming that if I can up the fuel, everything will be OK. Right? If so, what's the easiest way to do that?

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  3. #2
    Registered User is2scooby's Avatar
    Join Date
    Jun 2002
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    Honolulu, HI
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    Put the original air filter back on.

    I have run 12.75 @ 105+ on the stock air filter in the stock box (minus the resonator).
    Aloha, Richard...
    Retired Moderator
    TXS Stage 4 UTEC + TMIC + JoeP
    12.75 @ 105.67mph - 1.74 60'

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