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2005 SWAP UPSTREAM O2 SENSOR- Rid Code P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Recently I received a DTC code P0420 prompting me from my CEL. The live feed data from my OB2 code reader revealed a consistent “0” on upstream...
Thread by: Prius_Angie, May 3, 2018, 1 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
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