Replace Catalytic converter and P0420 still there
I own a 07 Lexus IS 250 AWD with 90k miles that replaced both bank 1 O2 sensors and also new cat converter but the ecm P0420 came back at 30 miles after driving.
I try this: 1. I disconnect the air fuel sensor before cat and drove the car and just one code came up P0051 (Why just this one and not the P0420)
- Short term fuel trim on bank 1 is -2.3%
- And long term fuel trim read -23.4%
I will appreciate all your help…