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.
2012 Lexus HS 250hFACTORY OEM SERVICE PROCEDURE
Engine Control System (Diagnostic Codes (P0010-P2419))
- SFI System
- DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1)
- DTC P0011, P0012: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1); Camshaft Position "A" - Timing Over-Retarded (Bank 1)
- DTC P0016: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
- DTC P0031, P0032, P101D: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1); A/F Sensor Heater Circuit Performance Bank 1 Sensor 1 Stuck ON
- DTC P0037, P0038, P0141, P102D: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2); Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2); Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2); O2 Sensor Heater Circuit Performance Bank 1 Sensor 2 Stuck ON
- DTC P0101: Mass Air Flow Circuit Range/Performance Problem
- DTC P0102, P0103: Mass or Volume Air Flow Circuit Low Input; Mass or Volume Air Flow Circuit High Input
- DTC P0106: Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
- DTC P0107, P0108: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input; Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- DTC P0111: Intake Air Temperature Sensor Gradient Too High
- DTC P0112, P0113: Intake Air Temperature Circuit Low Input; Intake Air Temperature Circuit High Input
- DTC P0115, P0117, P0118: Engine Coolant Temperature Circuit Malfunction; Engine Coolant Temperature Circuit Low Input; Engine Coolant Temperature Circuit High Input
- DTC P0116: Engine Coolant Temperature Circuit Range/Performance Problem
- DTC P011B: Engine Coolant Temperature/Intake Air Temperature Correlation
- DTC P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135: Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction; Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem; Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input; Throttle/Pedal Position Sensor/Switch "A" Circuit High Input; Throttle/Pedal Position Sensor/Switch "B" Circuit; Throttle/Pedal Position Sensor/Switch "B" Circuit Low Input; Throttle/Pedal Position Sensor/Switch "B" Circuit High Input; Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation
- DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
- DTC P0136, P0137, P0138, P0139: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)
- DTC P0171, P0172: System Too Lean (Bank 1); System Too Rich (Bank 1)
- DTC P0300, P0301, P0302, P0303, P0304: Random/Multiple Cylinder Misfire Detected; Cylinder 1 Misfire Detected; Cylinder 2 Misfire Detected; Cylinder 3 Misfire Detected; Cylinder 4 Misfire Detected
- DTC P0327, P0328: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
- DTC P0335: Crankshaft Position Sensor "A" Circuit
- DTC P0340: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
- DTC P0351, P0352, P0353, P0354: Ignition Coil "A" Primary/Secondary Circuit; Ignition Coil "B" Primary/Secondary Circuit; Ignition Coil "C" Primary/Secondary Circuit; Ignition Coil "D" Primary/Secondary Circuit
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P043E, P043F, P2401, P2402, P2419: Evaporative Emission System Reference Orifice Clog Up; Evaporative Emission System Reference Orifice High Flow; Evaporative Emission System Leak Detection Pump Control Circuit Low; Evaporative Emission System Leak Detection Pump Control Circuit High; Evaporative Emission System Switching Valve Control Circuit Low
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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