Section 69 (Engine Control System - Diagnostic Codes (P0420-P0450))
WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
- SFI System
- DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1 [08/2023 - ]
- DTC P043E-00: Evaporative Emission System Leak Detection Reference Orifice Low Flow; DTC P043F-00: Evaporative Emission System Leak Detection Reference Orifice High Flow; DTC P0446-72: EVAP System Vent Valve Stuck Open Actuator Stuck Open; DTC P2400-7E: Evaporative Emission System Leak Detection Pump Control Circuit Actuator Stuck On; DTC P2400-7F: Evaporative Emission System Leak Detection Pump Control Circuit Actuator Stuck Off [10/2022 - 08/2023]
- DTC P043E-00: Evaporative Emission System Leak Detection Reference Orifice Low Flow; DTC P043F-00: Evaporative Emission System Leak Detection Reference Orifice High Flow; DTC P0446-72: EVAP System Vent Valve Stuck Open Actuator Stuck Open; DTC P2400-7E: Evaporative Emission System Leak Detection Pump Control Circuit Actuator Stuck On; DTC P2400-7F: Evaporative Emission System Leak Detection Pump Control Circuit Actuator Stuck Off [08/2023 - ]
- DTC P0441-7E: Evaporative Emission System Incorrect Purge Flow Actuator Stuck On; DTC P0441-7F: Evaporative Emission System Incorrect Purge Flow Actuator Stuck Off; DTC P0441-9C: Evaporative Emission System Incorrect Purge Flow Low/Insufficient Flow [10/2022 - 08/2023]
- DTC P0441-7E: Evaporative Emission System Incorrect Purge Flow Actuator Stuck On; DTC P0441-7F: Evaporative Emission System Incorrect Purge Flow Actuator Stuck Off; DTC P0441-9C: Evaporative Emission System Incorrect Purge Flow Low/Insufficient Flow [08/2023 - ]
- DTC P0443-13: Evaporative Emission System Purge Control Valve "A" Circuit Open [10/2022 - ]
- DTC P0450-11: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground; DTC P0450-15: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Battery or Open; DTC P0450-2F: Evaporative Emission System Pressure Sensor/Switch Signal Erratic [10/2022 - 08/2023]
- DTC P0450-11: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground; DTC P0450-15: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Battery or Open; DTC P0450-2F: Evaporative Emission System Pressure Sensor/Switch Signal Erratic [08/2023 - 10/2024]