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, FWDFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (4 Of 9)
- SFI System
- 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 [05/2018 - ]
- 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 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 [10/2014 - 09/2015]
- 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 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 [09/2015 - 05/2018]
- 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 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 [05/2018 - 07/2020]
- 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 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 [07/2020 - ]
- DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1; DTC P1170-00: Fuel Performance/Port Injector; DTC P117B-00: Fuel Performance/Direct Injector [10/2014 - 09/2017]
- DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1; DTC P1170-00: Fuel Performance/Port Injector; DTC P117B-00: Fuel Performance/Direct Injector [09/2017 - 05/2018]
- DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1; DTC P1170-00: Fuel Performance/Port Injector; DTC P117B-00: Fuel Performance/Direct Injector [05/2018 - ]
- DTC P0190-11: Fuel Rail Pressure Sensor "A" Circuit Short to Ground [10/2014 - 05/2019]
- DTC P0190-11: Fuel Rail Pressure Sensor "A" Circuit Short to Ground [05/2019 - ]
- DTC P0190-15: Fuel Rail Pressure Sensor "A" Circuit Short to Battery or Open [10/2014 - ]
- DTC P0190-23: Fuel Rail Pressure Sensor "A" Signal Stuck Low; DTC P0190-24: Fuel Rail Pressure Sensor "A" Signal Stuck High [10/2014 - 09/2016]
- DTC P0190-23: Fuel Rail Pressure Sensor "A" Signal Stuck Low; DTC P0190-24: Fuel Rail Pressure Sensor "A" Signal Stuck High [09/2016 - 05/2018]
- DTC P0190-2A: Fuel Rail Pressure Sensor "A" Signal Stuck in Range; DTC P0190-64: Fuel Rail Pressure Sensor "A" Signal Plausibility Failure [05/2018 - ]
- DTC P0195-11: Engine Oil Temperature Sensor Circuit Short to Ground [10/2014 - ]
- DTC P0195-15: Engine Oil Temperature Sensor Circuit Short to Battery or Open [10/2014 - ]
- DTC P0201-13: Cylinder 1 Injector "A" Circuit Open; DTC P0202-13: Cylinder 2 Injector "A" Circuit Open; DTC P0203-13: Cylinder 3 Injector "A" Circuit Open; DTC P0204-13: Cylinder 4 Injector "A" Circuit Open; DTC P062D-13: Fuel Injector Driver Circuit Performance Bank 1 Circuit Open [10/2014 - ]
- DTC P0234-00: Turbocharger/Supercharger "A" Overboost Condition [10/2014 - ]
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.