June 29, 20196 yr Any recommendations for O2 sensors for 05 Outback AT? 195K miles. Pesky P0420 has worn me down. Started at 105K miles. After 6 years of being able to clear code and set readiness parameters for Emissions inspections here in CT, the code now comes back almost immediately after clearing. Many years ago CarDoc on the Outback forum had diagnosed the cat as bad after having me run some live scans (I can't remember which at this point). Before that, at 105K miles, I had changed the front O2 sensor (behind the first cat) but that didn't help. I did not change the front air fuel ratio sensor (before the first cat) at that time. Ordered a $200 Cat from Eastern Catalytic but fear that the sensors may also be shot. Haven't detected any exhaust leaks. Car runs fine. Gas mileage hasn't changed. Inspection is due in 2 weeks so I am trying to get my ducks in a row.
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