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  1. 2013 Subaru Outback P0031 Code (O2 sensor) Diagnosis - Mechanic recommends replacing all four sensors. Good $500 investment @ 150k mi? (in ~SF)

    Problems & Maintenance
    Hey folks! RE: my 2013 Subaru Outback P0031 Code (O2 sensor) Diagnosis Mechanic recommends replacing all four sensors since I'm at 150k miles and he expects the others to fail soon enough. Is that a good $500 investment in your estimation? Here's the quote I received (incl. oil change, excl...
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