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 450h BaseFACTORY OEM SERVICE PROCEDURE
Engine Control System (Diagnostic Codes) (7 Of 8)
- SFI System
- DTC P11EA: Bank 1 Air-Fuel Ratio Imbalance (Port); DTC P11EB: Bank 2 Air-Fuel Ratio Imbalance (Port); DTC P11EC: Cylinder 1 Air-Fuel Ratio Imbalance (Port); DTC P11ED: Cylinder 2 Air-Fuel Ratio Imbalance (Port); DTC P11EE: Cylinder 3 Air-Fuel Ratio Imbalance (Port); DTC P11EF: Cylinder 4 Air-Fuel Ratio Imbalance (Port); DTC P11F0: Cylinder 5 Air-Fuel Ratio Imbalance (Port); DTC P11F1: Cylinder 6 Air-Fuel Ratio Imbalance (Port); DTC P219A: Bank 1 Air-Fuel Ratio Imbalance; DTC P219B: Bank 2 Air-Fuel Ratio Imbalance; DTC P219C: Cylinder 1 Air-Fuel Ratio Imbalance; DTC P219D: Cylinder 2 Air-Fuel Ratio Imbalance; DTC P219E: Cylinder 3 Air-Fuel Ratio Imbalance; DTC P219F: Cylinder 4 Air-Fuel Ratio Imbalance; DTC P21A0: Cylinder 5 Air-Fuel Ratio Imbalance; DTC P21A1: Cylinder 6 Air-Fuel Ratio Imbalance [07/2020 - ]
- DTC P122E: High Pressure Fuel Pump Leak Malfunction [10/2015 - ]
- DTC P122F: High Pressure Fuel Pump Boost Malfunction (High Temperature) [10/2015 - ]
- DTC P1235: High Pressure Fuel Pump Circuit [10/2015 - ]
- DTC P1276: Port Injector Circuit #1; DTC P1277: Port Injector Circuit #2; DTC P1278: Port Injector Circuit #3; DTC P1279: Port Injector Circuit #4; DTC P127A: Port Injector Circuit #5; DTC P127B: Port Injector Circuit #6 [10/2015 - ]
- DTC P1420: Evaporative Emission Canister Small Leak; DTC P1421: Evaporative Emission Canister Gross Leak [10/2015 - ]
- DTC P1422: Fuel Tank Small Leak; DTC P1423: Fuel Tank Gross Leak [10/2015 - ]
- DTC P1451: Fuel Tank Pressure Sensor Range/Performance; DTC P1452: Fuel Tank Pressure Sensor Low Input; DTC P1453: Fuel Tank Pressure Sensor High Input [10/2015 - 08/2018]
- DTC P1451: Fuel Tank Pressure Sensor Range/Performance; DTC P1452: Fuel Tank Pressure Sensor Low Input; DTC P1453: Fuel Tank Pressure Sensor High Input [08/2018 - ]
- DTC P1604: Startability Malfunction [10/2015 - ]
- DTC P1605: Rough Idling [10/2015 - ]
- DTC P2102: Throttle Actuator Control Motor Circuit Low; DTC P2103: Throttle Actuator Control Motor Circuit High [10/2015 - ]
- DTC P2109: Throttle / Pedal Position Sensor "A" Minimum Stop Performance [10/2015 - ]
- DTC P2111: Throttle Actuator Control System - Stuck Open; DTC P2112: Throttle Actuator Control System - Stuck Closed [10/2015 - ]
- DTC P2118: Throttle Actuator Control Motor Current Range / Performance [10/2015 - ]
- DTC P2119: Throttle Actuator Control Throttle Body Range / Performance [10/2015 - ]
- DTC P2195: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1); DTC P2196: Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1); DTC P2197: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 2 Sensor 1); DTC P2198: Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2 Sensor 1) [10/2015 - 07/2020]
- DTC P2195: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1); DTC P2196: Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1); DTC P2197: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 2 Sensor 1); DTC P2198: Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2 Sensor 1) [07/2020 - ]
- DTC P2237: Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 1 Sensor 1); DTC P2238: Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 1 Sensor 1); DTC P2239: Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 1 Sensor 1); DTC P2240: Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 2 Sensor 1); DTC P2241: Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 2 Sensor 1); DTC P2242: Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 2 Sensor 1); DTC P2252: Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 1 Sensor 1); DTC P2253: Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 1 Sensor 1); DTC P2255: Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 2 Sensor 1); DTC P2256: Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 2 Sensor 1) [10/2015 - 07/2020]
- DTC P2237: Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 1 Sensor 1); DTC P2238: Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 1 Sensor 1); DTC P2239: Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 1 Sensor 1); DTC P2240: Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 2 Sensor 1); DTC P2241: Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 2 Sensor 1); DTC P2242: Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 2 Sensor 1); DTC P2252: Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 1 Sensor 1); DTC P2253: Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 1 Sensor 1); DTC P2255: Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 2 Sensor 1); DTC P2256: Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 2 Sensor 1) [07/2020 - ]
- DTC P2420: Evaporative Emission Pressure Switching Valve Stuck OFF [10/2015 - ]
- DTC P2450: Fuel Vapor-containment Valve Stuck Open; DTC P2451: Fuel Vapor-containment Valve Stuck Closed [10/2015 - ]
- DTC P2610: ECM / PCM Internal Engine Off Timer Performance [10/2015 - ]
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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