Active Exhaust Gas Temperature Sensor Fault

The exhaust gas temperature sensor measures how hot the exhaust gases are. If it's faulty, the computer can't accurately monitor exhaust temperatures, which can lead to performance issues.

The engine control module (ECM) expects a voltage reading signal from the exhaust gas temperature sensor that typically ranges from 0.5V to 4.5V, depending on temperature. If the signal is outside this range or absent altogether, the ECM triggers the fault code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Check the sensor wiring for any visible damage, shorts, or open circuits; repair as necessary. Decision: Is wiring intact? If no, repair wiring; if yes, proceed to next step.
2. 2Inspect the connector for corrosion or damage; clean or replace if needed. Decision: Is connector in good condition? If no, repair connector; if yes, proceed to next step.
3. 3Using a multimeter, measure the voltage output of the exhaust gas temperature sensor; values should be between 0.5V and 4.5V while the engine is running. Decision: Is voltage within spec? If no, replace the sensor; if yes, proceed to next step.
4. 4Check exhaust system for leaks that could affect temperature readings; repair any leaks found. Decision: Are there any leaks? If yes, repair leaks; if no, further diagnosis may be required.

• Failed exhaust gas temperature sensor
• Wiring issues like short or open circuits
• Connector corrosion or damage
• Exhaust system leaks affecting temperature readings

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