Jan 19, 2019 · Code P0420 is causing check engine light. After clearing the code, it is immediately pending again and will return to permanent within 20 or 30 miles....

Aug 22, 2014 · I erased the P0420 code. I have now driven the car over 400 miles and no check engine light. So obviously, the main problem with the P0420 code was the bad cat. This cat …

Jul 23, 2013 · My 2001 (250K plus miles on the ODO) got a check engine light with P0420 code under conditions of unseasonally high mid-day ambient temperature combined with a highway …

May 12, 2018 · P0420 code after replacing catalytic converter, slightly overfilled oil Discussion in ' Gen 2 Prius Care, Maintenance and Troubleshooting ' started by tangerino, Apr 14, 2021.

Oct 1, 2008 · About a year ago, the check engine light came on on my 2001 Prius, with a P0420 code, which is faulty catalytic converter function. So I took it to Toyota for diagnosis. They said …

Jun 9, 2022 · P0420 intermittent check engine light. Discussion in ' Gen 2 Prius Care, Maintenance and Troubleshooting ' started by Adam W, Jun 9, 2022.

Mar 8, 2009 · 2006 Prius with Check Engine Light - P0420 Code Discussion in ' Gen 2 Prius Care, Maintenance and Troubleshooting ' started by Ytsejamer1, Sep 1, 2012.

Dec 13, 2008 · P0420 code Discussion in ' Gen 2 Prius Care, Maintenance and Troubleshooting ' started by calabrsn, Apr 5, 2015.

Dec 31, 2015 · P0420: How to diagnose origin of problem Discussion in ' Gen 2 Prius Care, Maintenance and Troubleshooting ' started by Gabriel Teixeira, Feb 19, 2016.

Jan 19, 2020 · P0420-Catalyst System Efficiency Below Threshold (Bank 1) Gas leakage in exhaust system A/F Sensor (bank 1 sensor 1) Heated oxygen sensor (bank 1 sensor 2) Three …