glennb

This statement below is correct. If you have the MT (manual transmission) version of the subaru outback you have the dual inline cats. You must replace the front sensor with a factory OEM to get everything working right. Be prepared to pay $150 to $180 for it. That said the rear is just a plain oxygen sensor and an oem good equivalent will work. >>>Seems the use of a fuel-air ratio sensor is specific for the MT Legacy.