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.
2016 Lexus GS FFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes And Circuit Tests
- SFI System
- DTC P2120: Throttle / Pedal Position Sensor / Switch "D" Circuit; DTC P2122: Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input; DTC P2123: Throttle / Pedal Position Sensor / Switch "D" Circuit High Input; DTC P2125: Throttle / Pedal Position Sensor / Switch "E" Circuit; DTC P2127: Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input; DTC P2128: Throttle / Pedal Position Sensor / Switch "E" Circuit High Input; DTC P2138: Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation [10/2015 - ]
- DTC P2121: Throttle / Pedal Position Sensor / Switch "D" Circuit 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 - ]
- 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 - 09/2016]
- 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) [09/2016 - ]
- DTC P2420: Evaporative Emission Pressure Switching Valve Stuck OFF [10/2015 - ]
- DTC P2610: ECM / PCM Internal Engine Off Timer Performance [10/2015 - ]
- DTC U0101: Lost Communication with TCM [10/2015 - ]
- Circuit Tests
- EVAP System [10/2015 - ]
- ECM Power Source Circuit [10/2015 - ]
- VC Output Circuit [10/2015 - ]
- Fuel Pump Control Circuit [10/2015 - 09/2017]
- Fuel Pump Control Circuit [09/2017 - ]
- Starter Signal Circuit [10/2015 - ]
- Air Intake Control Circuit [10/2015 - ]
- Brake Override System [10/2015 - 09/2017]
- Brake Override System [09/2017 - ]
- MIL Circuit [10/2015 - ]
- Pattern Select Switch Snow Mode Circuit [10/2015 - ]
- Drive Start Control System [10/2015 - 09/2017]
- Drive Start Control System [09/2017 - 05/2018]
- Drive Start Control [05/2018 - ]
Factory Service Tools
Use the Manual With the Right Hardware
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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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