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Member
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Join Date: Jul 2016
Location: Western US
Posts: 281
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Member
Join Date: Jul 2016
Location: Western US
Posts: 281
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My dad had the P0171 code(lean code) on his 4runner, we went through all the advice that has been said in this thread, but what fixed it was replacing the front O2 sensor. Just something to consider if you are still having the code after trying all the advice above.
That's one good thing about owning multiple 4runners in the family. It's easy to change out parts with known good ones, saving us from buying it until we know exactly which part is faulty. If this is possible for you, try switching parts out.
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97 Charged, lifted, armored, geared, locked SR5.
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