Home >> Lexus >> 2017 >> RC 300 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (2GR-FSE) - Diagnostic Codes (3 Of 5) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) [09/2014 - 11/2017] >> Typical Malfunction Thresholds