Ultimate Guide to Lexus OBD-II Trouble Codes & Diagnostic Help

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David Lawrence

As you pop the hood of your Lexus, you’re confronted with a mystery: the check engine light is on, and you’re not sure why. You’ve heard of OBD/OBD2 codes, but what do they mean, and how can they help you diagnose the issue? With hundreds of possible codes, each corresponding to a specific problem, it can be overwhelming.

But what if you knew that deciphering these codes could lead you to a quick fix, saving you time and money? You’ll want to learn more about the common error codes and solutions to get your Lexus back on the road.

Lexus Obd Obd2 Codes

Lexus OBD/OBD2 Code List

Hundreds of specific codes comprise the Lexus OBD/OBD2 code list, each corresponding to a particular issue in your vehicle.

These codes cover various systems, including engine, transmission, and emissions, providing detailed information on fault codes and vehicle systems.

You’ll find codes like P1127 ETCS Actuator Power Source Circuit Malfunction and P1128 Throttle Control Motor Lock Malfunction, which indicate issues with the throttle control motor.

Other codes, such as those related to Air/Fuel Ratio, Throttle Position Sensor, and Fuel Pump Relay/ECU, help diagnose problems with sensor circuits and fuel systems.

When you encounter a code, you can use the Lexus OBD/OBD2 code list to identify the issue and take corrective action.

Common Error Codes and Solutions

Your Lexus’s onboard diagnostic system is designed to alert you to potential issues, and understanding common error codes is essential for prompt diagnosis and repair.

One common error code is P1127, indicating an ETCS Actuator Power Source Circuit Malfunction, which can be caused by a faulty throttle position sensor or wiring issue in the ETCS circuit.

Another code, P1130, represents an A/F Sensor-11 (Bank 1 Sensor 1) Circuit Malfunction, potentially due to a faulty air-fuel ratio sensor or wiring issue in the sensor circuit.

Additionally, P1300, P1345, and P135 codes may indicate issues with the igniter circuit, VVT sensor circuit, and fuel trim circuit, respectively.

Troubleshooting and Repair Tips

Now that you’ve identified the error codes, it’s time to start troubleshooting and repairing your Lexus.

First, use a code reader to retrieve and clear error codes, providing valuable information about the issue. Common issues include oxygen sensor problems, intake air temperature sensor signal issues, and air-fuel ratio imbalances.

The Equus code reader is a popular option, providing accurate readings and compatibility with various Lexus models.

When diagnosing circuit malfunctions, check the throttle position sensor, speed sensor, and fuel pump relay/ECU for any signs of malfunction.

Clear codes after completing repairs and recheck the vehicle to confirm the issue is resolved.

Online resources, such as the Lexus Owners Club of North America, can offer valuable support and guidance throughout the process.

Most Common Lexus OBD-II Trouble Codes

CodeDescription
P1100BARO Sensor Circuit Malfunction
P1120Accelerator Pedal Position Sensor Circuit Malfunction
P1121Accelerator Pedal Position Sensor Range/Performance Problem
P1125Throttle Control Motor Circuit Malfunction
P1126Magnetic Clutch Circuit Malfunction
P1127ECTS Actuator Power Source Circuit Malfunction
P1128Throttle Control Motor Lock Malfunction
P1129Electronic Throttle Control System
P1130Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 1 Sensor 1)
P1133Air/Fuel Ratio Sensor Circuit Response Malfunction (Bank 1 Sensor 1)
P1135Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P1150Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 2 Sensor 1)
P1153Air/Fuel Ratio Sensor Circuit Response Malfunction (Bank 2 Sensor 1)
P1155Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P1200Fuel Pump Relay/ECU Circuit Malfunction
P1300Igniter Circuit Malfunction (Bank 1 Or No. 1)
P1305Igniter Circuit Malfunction (Bank 2 Or No. 2)
P1310Igniter Circuit Malfunction (No. 3)
P1315Igniter Circuit Malfunction (No. 4)
P1320Igniter Circuit Malfunction (No. 5)
P1325Igniter Circuit Malfunction (No. 6)
P1330Igniter Circuit Malfunction (No. 7)
P1335CKP Sensor Circuit Malfunction During Engine Running
P1340Igniter Circuit Malfunction (No. 8)
P1345VVT Sensor Circuit Malfunction (Bank 1)
P1346VVT Sensor Range/Performance Problem (Bank 1)
P1349VVT System Malfunction (Bank 1)
P1350VVT Sensor Circuit Malfunction (Bank 2)
P1351VVT Sensor Range/Performance Problem (Bank 2)
P1354VVT System Malfunction (Bank 2)
P1400Sub-TP Sensor Malfunction
P1401Sub-TP Sensor Range/Performance
P1410EGR Valve Position Sensor Circuit Malfunction
P1411EGR Valve Position Sensor Circuit Range/Performance Malfunction
P1500Starter Signal Circuit Malfunction
P1520Stop Lamp Switch Malfunction
P1565Cruise Control Main Switch Circuit Malfunction
P1566Cruise Control Main Switch Circuit Malfunction
P1600ECM BATT Malfunction
P1605Knock Control CPU Malfunction
P1633ECM Malfunction (ETCS Circuit)
P1645Body ECU Malfunction
P1656OCV Circuit Malfunction (Bank 1)
P1663OCV Circuit Malfunction (Bank 2)
P1780PNP Switch Malfunction
B2785Ignition Switch On Malfunction (Immobilizer System)
B2786Ignition Switch Off Malfunction (Immobilizer System)
B2791Key Unlock Warning Switch Malfunction (Immobilizer System)
B2795Unmatch Key Code (Immobilizer System)
B2796No Communication In Immobilizer System
B2797Communication Malfunction No. 1 (Immobilizer System)
B2798Communication Malfunction No. 2 (Immobilizer System)
About the author
David Lawrence
David grew up among mechanics and off-road enthusiasts, gaining deep knowledge in car mods, off-roading techniques, and automotive engineering, making him a trusted 4x4 expert.

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