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.
2007 Lexus GX 470FACTORY OEM SERVICE PROCEDURE
Engine Control System - DTC P0657 - P2A03
- DTC P0657: Actuator Supply Voltage Circuit/Open
- DTC P1340, P1341: Camshaft Position Sensor "A" (Bank 1 Sensor 2)
- DTC P1440, P1443: Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 1; Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 2
- DTC P1441, P1444, P2440: Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 1; Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 2; Secondary Air Injection System Switching Valve Stuck Open Bank1
- DTC P1442, P1445, P2441: Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 1; Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 2; Secondary Air Injection System Switching Valve Stuck Close Bank 1
- DTC P1613: Secondary Air Injection Driver Malfunction
- DTC P2102, P2103: Throttle Actuator Control Motor Circuit Low; Throttle Actuator Control Motor Circuit High
- DTC P2111, P2112: Throttle Actuator Control System - Stuck Open; Throttle Actuator Control System - Stuck Closed
- DTC P2118: Throttle Actuator Control Motor Current Range/Performance
- DTC P2119: Throttle Actuator Control Throttle Body Range/Performance
- DTC P2120, P2122, P2123, P2125, P2127, P2128, P2138: Throttle/Pedal Position Sensor/Switch "D" Circuit; Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input; Throttle/Pedal Position Sensor/Switch "D" Circuit High Input; Throttle/Pedal Position Sensor/Switch "E" Circuit; Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input; Throttle/Pedal Position Sensor/Switch "E" Circuit High Input; Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation
- DTC P2121: Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance
- DTC P2195, P2196, P2197, P2198: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1); Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1); Oxygen (A/F) Sensor Signal Stuck Lean (Bank 2 Sensor 1); Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2 Sensor 1)
- DTC P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256: Oxygen (A/F) Sensor Pumping Current Circuit/Open (Bank 1 Sensor 1); Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1); Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1); DTC P2240 Oxygen (A/F) Sensor Pumping Current Circuit/Open (Bank 2 Sensor 1); Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 2 Sensor 1); Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 2 Sensor 1); Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1); Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1); Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1); Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 2 Sensor 1)
- DTC P2401, P2402: Evaporative Emission Leak Detection Pump Stuck OFF; Evaporative Emission Leak Detection Pump Stuck ON
- DTC P2419, P2420: Evaporative Emission Pressure Switching Valve Stuck ON; Evaporative Emission Pressure Switching Valve Stuck OFF
- DTC P2430, P2431, P2432, P2433: Secondary Air Injection System Air Flow/Pressure Sensor Circuit Bank 1; Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1; Secondary Air Injection System Air Flow/Pressure Sensor Circuit Low Bank 1; Secondary Air Injection System Air Flow/Pressure Sensor Circuit High Bank 1
- DTC P2444, P2445: Secondary Air Injection System Pump Stuck On Bank 1; Secondary Air Injection System Pump Stuck Off Bank 1
- DTC P2610: ECM/PCM Internal Engine Off Timer Performance
- DTC P2A00, P2A03: A/F Sensor Circuit Slow Response (Bank 1 Sensor 1); A/F Sensor Circuit Slow Response (Bank 2 Sensor 1)
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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