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 LC 500hFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (5 Of 9)
- SFI System
- DTC P0401-9C: Exhaust Gas Recirculation "A" Low / Insufficient Flow [01/2017 - 09/2018]
- DTC P0401-9C: Exhaust Gas Recirculation "A" Low / Insufficient Flow [09/2018 - 04/2020]
- DTC P0403-14: Exhaust Gas Recirculation "A" Control Circuit 1 Open; DTC P1400-00: Exhaust Gas Recirculation "A" Control Circuit 2 Open; DTC P1405-96: Exhaust Gas Recirculation "A" Control Circuit 3 Open; DTC P1410-04: Exhaust Gas Recirculation "A" Control Circuit 4 Open [01/2017 - 04/2020]
- DTC P0403-14: Exhaust Gas Recirculation "A" Control Circuit 1 Open; DTC P1400-00: Exhaust Gas Recirculation "A" Control Circuit 2 Open; DTC P1405-96: Exhaust Gas Recirculation "A" Control Circuit 3 Open; DTC P1410-04: Exhaust Gas Recirculation "A" Control Circuit 4 Open [04/2020 - ]
- DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1; DTC P0430-00: Catalyst System Efficiency Below Threshold Bank 2 [01/2017 - 04/2020]
- DTC P0420-00: Catalyst System Efficiency Below Threshold Bank 1; DTC P0430-00: Catalyst System Efficiency Below Threshold Bank 2 [04/2020 - ]
- 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 [01/2017 - ]
- 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 [01/2017 - ]
- 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 [01/2017 - 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 - ]
- DTC P0505-00: Idle Control System [01/2017 - 04/2020]
- DTC P0505-00: Idle Control System [04/2020 - 05/2023]
- DTC P0505-00: Idle Control System [05/2023 - ]
- DTC P050A-00: Cold Start Idle Control System Performance [01/2017 - 09/2018]
- DTC P050A-00: Cold Start Idle Control System Performance [09/2018 - 04/2020]
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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