Exhaust Gas Temperature Sensor 2 Circuit Low
The circuit for the second exhaust gas temperature sensor is reading low.
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What it means (plain English)
The second exhaust gas temperature sensor monitors the temperature downstream in the exhaust system. If it's reading very low, it might indicate a problem with the sensor or its wiring, meaning the ECU thinks the exhaust isn’t hot enough.
What the computer is actually seeing
The engine control unit (ECU) sees a voltage from the temperature sensor that is below the normal range, typically under 0.5 volts, which indicates cooler exhaust temperatures than expected.
What a healthy reading looks like
For a properly functioning sensor, the voltage should be around 0.5 to 2.5 volts at operating temperature, depending on the exhaust conditions, corresponding to exhaust temperatures of roughly 100°C to 600°C (212°F to 1112°F).
Guided diagnostic — the DiagCoach way
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.
- 11. Check the wiring and connectors to the exhaust gas temperature sensor for damage or loose connections. Decision: Are the connections secure and undamaged?
- 22. Measure the voltage at the exhaust gas temperature sensor connector. It should be within 0.5 to 2.5 volts when the engine is running. Decision: Is the voltage reading within the expected range?
- 33. If the voltage is low or absent, test the sensor by unplugging it and checking for continuity in the wiring harness. Decision: Is there continuity?
- 44. If continuity is good, replace the exhaust gas temperature sensor. If continuity is bad, repair the wiring before replacing the sensor.
Common causes
- Faulty exhaust gas temperature sensor
- Damaged wiring or connectors
- Poor electrical connection at the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate, so you can drive, but it's advisable to fix it soon to avoid exhaust system damage.
Will this code come back after resetting?
If the problem isn't fixed, it will likely return after a few drive cycles.
Why does this code sometimes pair with other codes?
Exhaust temperature issues can often cause or coincide with other related sensor failures, reflecting problems in the exhaust system.
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