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 RC F BaseFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (3 Of 9)
- SFI System
- DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2); DTC P1170: Fuel Performance / Port Injector; DTC P117B: Fuel Performance / Direct Injector [10/2015 - 11/2017]
- DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2); DTC P1170: Fuel Performance / Port Injector; DTC P117B: Fuel Performance / Direct Injector [11/2017 - ]
- DTC P0191: Fuel Rail Pressure Sensor Circuit Range / Performance [09/2014 - 03/2019]
- DTC P0191: Fuel Rail Pressure Sensor Circuit Range / Performance [03/2019 - ]
- DTC P0192: Fuel Rail Pressure Sensor Circuit Low Input; DTC P0193: Fuel Rail Pressure Sensor Circuit High Input [09/2014 - 10/2015]
- DTC P0192: Fuel Rail Pressure Sensor Circuit Low Input; DTC P0193: Fuel Rail Pressure Sensor Circuit High Input [10/2015 - ]
- DTC P0201: Injector Circuit / Open - (Cylinder 1); DTC P0202: Injector Circuit / Open - (Cylinder 2); DTC P0203: Injector Circuit / Open - (Cylinder 3); DTC P0204: Injector Circuit / Open - (Cylinder 4); DTC P0205: Injector Circuit / Open - (Cylinder 5); DTC P0206: Injector Circuit / Open - (Cylinder 6); DTC P0207: Injector Circuit / Open - (Cylinder 7); DTC P0208: Injector Circuit / Open - (Cylinder 8); DTC P062D: No. 1 Fuel Injector Driver Circuit Performance; DTC P062E: No. 2 Fuel Injector Driver Circuit Performance [09/2014 - ]
- DTC P0230: Fuel Pump Primary Circuit [09/2014 - 01/2023]
- DTC P0300: Random / Multiple Cylinder Misfire Detected; DTC P0301: Cylinder 1 Misfire Detected; DTC P0302: Cylinder 2 Misfire Detected; DTC P0303: Cylinder 3 Misfire Detected; DTC P0304: Cylinder 4 Misfire Detected; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected; DTC P0307: Cylinder 7 Misfire Detected; DTC P0308: Cylinder 8 Misfire Detected [09/2014 - 10/2015]
- DTC P0300: Random / Multiple Cylinder Misfire Detected; DTC P0301: Cylinder 1 Misfire Detected; DTC P0302: Cylinder 2 Misfire Detected; DTC P0303: Cylinder 3 Misfire Detected; DTC P0304: Cylinder 4 Misfire Detected; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected; DTC P0307: Cylinder 7 Misfire Detected; DTC P0308: Cylinder 8 Misfire Detected [10/2015 - 11/2017]
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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