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2012 forester 2.5x P015A P015B

  

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I have a 2012 subaru forester pushing 90,000 miles. Started losing power, and motor sounds like its falling apart at around 4k rpms, and has trouble shifting in automatic (switch to "manual" to shift sooner). It had cylinder 2 and 4 misfire (P0302, P0304) replaced sparkplugs, cleared codes, solved that problem! Codes (P015A and P015B) replaced 2 o2 sensors, upstream and downstream, cleared codes, car still throwing (P015A and B) rich to lean, lean to rich. Help me please!! I'd like to fix this issue myself b4 spending and arm and a leg at a shop! P.s. car "jerks" while driving and rpms bounce 50-100 rpms.


1 Answer
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Start here on those 2 codes:

https://www.obd-codes.com/p015a

https://www.obd-codes.com/p015b


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