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 (04 Of 14)
- SFI System
- DTC P0120-11: Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground; DTC P0120-15: Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open; DTC P0120-1C: Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range; DTC P0220-11: Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground; DTC P0220-15: Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open; DTC P0225-11: Throttle/Pedal Position Sensor/Switch "C" Circuit Short to Ground; DTC P0225-15: Throttle/Pedal Position Sensor/Switch "C" Circuit Short to Battery or Open; DTC P0225-1C: Throttle/Pedal Position Sensor/Switch "C" Circuit Voltage Out of Range; DTC P212A-11: Throttle Position Sensor/Switch "G" Circuit Short to Ground; DTC P212A-15: Throttle Position Sensor/Switch "G" Circuit Short to Battery or Open; DTC P2135-2B: Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled; DTC P2AD1-2B: Throttle/Pedal Position Sensor/Switch "C"/"G" Signal Cross Coupled [12/2017 - ]
- DTC P0125-00: Insufficient Coolant Temperature for Closed Loop Fuel Control [12/2017 - 09/2018]
- DTC P0125-00: Insufficient Coolant Temperature for Closed Loop Fuel Control [09/2018 - 10/2023]
- DTC P0125-00: Insufficient Coolant Temperature for Closed Loop Fuel Control [10/2023 - ]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [12/2017 - 10/2020]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [10/2020 - 10/2022]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [10/2022 - 10/2023]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [10/2023 - ]
- DTC P012A-11: Turbocharger/Supercharger Inlet Pressure Sensor "A" Circuit Low Circuit Short to Ground; DTC P2374-11: Turbocharger/Supercharger Inlet Pressure Sensor "B" Circuit Low Circuit Short to Ground [12/2017 - ]
- DTC P012A-15: Turbocharger/Supercharger Inlet Pressure Sensor "A" Circuit High Circuit Short to Battery or Open; DTC P2374-15: Turbocharger/Supercharger Inlet Pressure Sensor "B" Circuit High Circuit Short to Battery or Open [12/2017 - ]
- DTC P0136-16: A/F (O2) Sensor Circuit Bank 1 Sensor 2 Circuit Current (Voltage) Below Threshold; DTC P013A-7C: A/F Sensor - Rich to Lean Bank 1 Sensor 2 Slow Response; DTC P013C-7C: A/F Sensor - Rich to Lean Bank 2 Sensor 2 Slow Response; DTC P0156-16: A/F (O2) Sensor Circuit Bank 2 Sensor 2 Circuit Current (Voltage) Below Threshold [12/2017 - 10/2020]
- DTC P0136-16: A/F (O2) Sensor Circuit Bank 1 Sensor 2 Circuit Current (Voltage) Below Threshold; DTC P013A-7C: A/F Sensor - Rich to Lean Bank 1 Sensor 2 Slow Response; DTC P013C-7C: A/F Sensor - Rich to Lean Bank 2 Sensor 2 Slow Response; DTC P0156-16: A/F (O2) Sensor Circuit Bank 2 Sensor 2 Circuit Current (Voltage) Below Threshold [10/2020 - 10/2022]
- DTC P0136-16: A/F (O2) Sensor Circuit Bank 1 Sensor 2 Circuit Current (Voltage) Below Threshold; DTC P013A-7C: A/F Sensor - Rich to Lean Bank 1 Sensor 2 Slow Response; DTC P013C-7C: A/F Sensor - Rich to Lean Bank 2 Sensor 2 Slow Response; DTC P0156-16: A/F (O2) Sensor Circuit Bank 2 Sensor 2 Circuit Current (Voltage) Below Threshold [10/2022 - 10/2023]
- DTC P0136-16: A/F (O2) Sensor Circuit Bank 1 Sensor 2 Circuit Current (Voltage) Below Threshold; DTC P013A-7C: A/F Sensor - Rich to Lean Bank 1 Sensor 2 Slow Response; DTC P013C-7C: A/F Sensor - Rich to Lean Bank 2 Sensor 2 Slow Response; DTC P0156-16: A/F (O2) Sensor Circuit Bank 2 Sensor 2 Circuit Current (Voltage) Below Threshold [10/2023 - ]
- DTC P014C-00: O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1; DTC P014D-00: O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1; DTC P014E-00: O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 1; DTC P014F-00: O2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 1; DTC P015A-00: O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1; DTC P015B-00: O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1; DTC P015C-00: O2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1; DTC P015D-00: O2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1 [12/2017 - 09/2019]
- DTC P014C-00: O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1; DTC P014D-00: O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1; DTC P014E-00: O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 1; DTC P014F-00: O2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 1; DTC P015A-00: O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1; DTC P015B-00: O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1; DTC P015C-00: O2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1; DTC P015D-00: O2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1 [09/2019 - 10/2020]
- DTC P014C-00: O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1; DTC P014D-00: O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1; DTC P014E-00: O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 1; DTC P014F-00: O2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 1; DTC P015A-00: O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1; DTC P015B-00: O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1; DTC P015C-00: O2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1; DTC P015D-00: O2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1 [10/2020 - 10/2022]
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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