Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Lexus LS 500 Base, AWDFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (08 Of 14)
- SFI System
- DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1; DTC P0430-00: Catalyst System Efficiency Below Threshold Bank 2 [10/2023 - ]
- 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 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; DTC P2418-7E: Evaporative Emission System Switching Valve Control Circuit Actuator Stuck On [12/2017 - 09/2019]
- 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 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; DTC P2418-7E: Evaporative Emission System Switching Valve Control Circuit Actuator Stuck On [09/2019 - ]
- DTC P0441-9C: Evaporative Emission System Incorrect Purge Flow Low/Insufficient Flow [12/2017 - ]
- 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 [12/2017 - 09/2018]
- 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 [09/2018 - 09/2019]
- 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 [09/2019 - ]
- DTC P0455-00: Evaporative Emission System Leak Detected (Large Leak); DTC P0456-00: Evaporative Emission System Leak Detected (Very Small Leak) [12/2017 - 09/2019]
- DTC P0455-00: Evaporative Emission System Leak Detected (Large Leak); DTC P0456-00: Evaporative Emission System Leak Detected (Very Small Leak) [09/2019 - ]
- DTC P0460-12: Fuel Level Sensor "A" Circuit Short to Battery; DTC P0460-14: Fuel Level Sensor "A" Circuit Short to Ground or Open [09/2019 - ]
- DTC P0460-2A: Fuel Level Sensor "A" Signal Stuck In Range [09/2019 - ]
- DTC P0500-31: Vehicle Speed Sensor "A" No Signal [12/2017 - 10/2023]
- DTC P0500-31: Vehicle Speed Sensor "A" No Signal [10/2023 - ]
- DTC P0504-2B: Brake Switch "A"/"B" Signal Cross Coupled [12/2017 - 10/2023]
- DTC P0504-2B: Brake Switch "A"/"B" Signal Cross Coupled [10/2023 - ]
- DTC P0505-00: Idle Control System [12/2017 - 10/2020]
- DTC P0505-00: Idle Control System [10/2020 - 10/2023]
- DTC P0505-00: Idle Control System [10/2023 - ]
- DTC P050A-00: Cold Start Idle Control System Performance [12/2017 - 10/2020]
- DTC P050A-00: Cold Start Idle Control System Performance [10/2020 - 10/2023]
- DTC P050A-00: Cold Start Idle Control System Performance [10/2023 - ]
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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