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 NX 300 Base, AWDFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (8 Of 9)
- SFI System
- DTC P1378-00: Pre-ignition Detected [09/2017 - 05/2019]
- DTC P1378-00: Pre-ignition Detected [05/2019 - ]
- DTC P148D-7E: Purge One Way Valve Stuck Open [10/2014 - 05/2018]
- DTC P148D-7E: Purge One Way Valve Stuck Open [05/2018 - ]
- DTC P15EA-12: Oil Jet Control Valve Circuit Short to Battery; DTC P15EA-14: Oil Jet Control Valve Circuit Short to Ground or Open [10/2014 - ]
- DTC P1603-00: Engine Stall History; DTC P1605-00: Rough Idling [10/2014 - 09/2017]
- DTC P1603-00: Engine Stall History; DTC P1605-00: Rough Idling [09/2017 - 05/2019]
- DTC P1603-00: Engine Stall History [05/2019 - ]
- DTC P1604-00: Startability Malfunction [10/2014 - ]
- DTC P1605-00: Rough Idling [05/2019 - ]
- DTC P1607-00: Cruise Control Input Processor [10/2014 - 09/2015]
- DTC P1607-00: Cruise Control Input Processor [09/2015 - 09/2016]
- DTC P1607-00: Cruise Control Input Processor [09/2016 - 05/2019]
- DTC P1607-00: Cruise Control Input Processor [05/2019 - ]
- DTC P2100-14: Throttle Actuator "A" Control Motor Circuit Short to Ground or Open; DTC P2100-15: Throttle Actuator "A" Control Motor Circuit Short to Battery or Open [10/2014 - 05/2019]
- DTC P2100-18: Throttle Actuator "A" Control Motor Circuit Current Below Threshold; DTC P2100-19: Throttle Actuator "A" Control Motor Circuit Current Above Threshold [05/2019 - ]
- DTC P2109-00: Throttle/Pedal Position Sensor "A" Minimum Stop Performance [09/2016 - ]
- DTC P2111-72: Throttle Actuator "A" Control System Actuator Stuck Open; DTC P2111-73: Throttle Actuator "A" Control System Actuator Stuck Closed [10/2014 - 05/2019]
- DTC P2111-72: Throttle Actuator "A" Control System Actuator Stuck Open; DTC P2111-73: Throttle Actuator "A" Control System Actuator Stuck Closed [05/2019 - ]
- DTC P2119-00: Throttle Actuator "A" Control Throttle Body Range/Performance; DTC P2119-04: Throttle Actuator "A" Control Throttle Body Range/Performance System Internal Failure; DTC P2119-77: Throttle Actuator "A" Control Throttle Body Range/Performance Commanded Position Not Reachable [10/2014 - 05/2019]
- DTC P2119-00: Throttle Actuator "A" Control Throttle Body Range/Performance; DTC P2119-04: Throttle Actuator "A" Control Throttle Body Range/Performance System Internal Failure; DTC P2119-77: Throttle Actuator "A" Control Throttle Body Range/Performance Commanded Position Not Reachable [05/2019 - ]
- DTC P2120-12: Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Battery; DTC P2120-14: Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Ground or Open; DTC P2120-1F: Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent; DTC P2125-12: Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Battery; DTC P2125-14: Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open; DTC P2125-1F: Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent; DTC P2138-2B: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled [10/2014 - ]
- DTC P2120-1C: Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range; DTC P2120-99: Throttle/Pedal Position Sensor/Switch "D" Exceeded Learning Limit [10/2014 - ]
- DTC P2195-19: A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Circuit Current Above Threshold; DTC P2195-24: A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Signal Stuck High; DTC P2196-18: A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 Circuit Current Below Threshold; DTC P2196-23: A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 Signal Stuck Low [05/2018 - ]
- DTC P2195-1D: O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Circuit Current Out of Range; DTC P2195-23: O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Signal Stuck Low; DTC P2196-1D: O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 Circuit Current Out of Range; DTC P2196-24: O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 Signal Stuck High [10/2014 - 05/2018]
- DTC P21CF-13: Cylinder 1 Injector "B" Circuit Open; DTC P21D0-13: Cylinder 2 Injector "B" Circuit Open; DTC P21D1-13: Cylinder 3 Injector "B" Circuit Open; DTC P21D2-13: Cylinder 4 Injector "B" Circuit Open [10/2014 - ]
- DTC P2226-11: Barometric Pressure Sensor "A" Circuit Short to Ground; DTC P2226-15: Barometric Pressure Sensor "A" Circuit Short to Battery or Open [10/2014 - ]
- DTC P2237-11: O2 Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground; DTC P2237-12: O2 Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Battery; DTC P2237-14: O2 Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground or Open; DTC P2237-16: O2 Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Below Threshold; DTC P2237-17: O2 Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Above Threshold; DTC P2237-1A: O2 Sensor Positive Current Control Bank 1 Sensor 1 Circuit Resistance Below Threshold; DTC P2251-11: O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Ground; DTC P2251-12: O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Battery [10/2014 - 09/2017]
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.