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 RX 350 Base, FWDFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (2 Of 7)
- SFI System
- DTC P0100-12: Mass or Volume Air Flow Sensor "A" Circuit Short to Battery; DTC P0100-14: Mass or Volume Air Flow Sensor "A" Circuit Short to Ground or Open [09/2015 - ]
- DTC P0100-64: Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure [09/2015 - 08/2016]
- DTC P0100-64: Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure [08/2016 - 07/2021]
- DTC P0100-64: Mass or Volume Air Flow Sensor "A" Signal Plausibility Failure [07/2021 - ]
- DTC P0110-11: Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground [09/2015 - ]
- DTC P0110-15: Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open [09/2015 - ]
- DTC P0110-2A: Intake Air Temperature Sensor 1 Bank 1 Signal Stuck in Range [09/2015 - 08/2019]
- DTC P0110-2A: Intake Air Temperature Sensor 1 Bank 1 Signal Stuck in Range [08/2019 - 07/2021]
- DTC P0110-2A: Intake Air Temperature Sensor 1 Bank 1 Signal Stuck in Range [07/2021 - ]
- DTC P0115-11: Engine Coolant Temperature Sensor 1 Circuit Short to Ground [09/2015 - ]
- DTC P0115-15: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open [09/2015 - 08/2018]
- DTC P0115-15: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open [08/2018 - ]
- DTC P0115-2A: Engine Coolant Temperature Sensor 1 Signal Stuck in Range [09/2015 - ]
- DTC P011B-62: Engine Coolant Temperature / Intake Air Temperature Signal Compare Failure [09/2015 - 07/2021]
- DTC P011B-62: Engine Coolant Temperature / Intake Air Temperature Signal Compare Failure [07/2021 - ]
- 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 P2135-2B: Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled [09/2015 - ]
- DTC P0125-00: Insufficient Coolant Temperature for Closed Loop Fuel Control [09/2015 - ]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [09/2015 - 12/2017]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [12/2017 - 08/2019]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [08/2019 - 07/2021]
- DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [07/2021 - ]
- DTC P0136-11: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Ground; DTC P0136-13: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Open; DTC P0136-14: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open; DTC P0136-15: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Battery or Open; DTC P0136-17: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Voltage Above Threshold; DTC P0136-23: O2 Sensor Circuit Bank 1 Sensor 2 Signal Stuck Low; DTC P013A-00: O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 2; DTC P013C-00: O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2; DTC P0156-11: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Short to Ground; DTC P0156-13: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Open; DTC P0156-14: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Short to Ground or Open; DTC P0156-15: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Short to Battery or Open; DTC P0156-17: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Voltage Above Threshold; DTC P0156-23: O2 Sensor Circuit Bank 2 Sensor 2 Signal Stuck Low [09/2015 - 08/2019]
- DTC P0136-11: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Ground; DTC P0136-13: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Open; DTC P0136-14: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open; DTC P0136-15: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Battery or Open; DTC P0136-17: O2 Sensor Circuit Bank 1 Sensor 2 Circuit Voltage Above Threshold; DTC P0136-23: O2 Sensor Circuit Bank 1 Sensor 2 Signal Stuck Low; DTC P013A-00: O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 2; DTC P013C-00: O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2; DTC P0156-11: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Short to Ground; DTC P0156-13: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Open; DTC P0156-14: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Short to Ground or Open; DTC P0156-15: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Short to Battery or Open; DTC P0156-17: O2 Sensor Circuit Bank 2 Sensor 2 Circuit Voltage Above Threshold; DTC P0156-23: O2 Sensor Circuit Bank 2 Sensor 2 Signal Stuck Low [08/2019 - ]
- 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 [09/2015 - 12/2017]
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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