Exhaust Gas Temperature Sensor 2 Circuit Low
The Exhaust Gas Temperature Sensor 2 is reporting a low input voltage.
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What it means (plain English)
The exhaust gas temperature sensor measures the temperature of the exhaust gases. If it sees a voltage drop too low (below 0.2V), it sends a signal that something's wrong, often indicating a wiring issue or a faulty sensor.
What the computer is actually seeing
The engine control module (ECM) expects a signal voltage from the sensor that typically ranges from 0.5V to 4.5V based on temperature. Below 0.2V indicates a problem.
What a healthy reading looks like
Sensor voltage should be between 0.5V (approx. 200°C) and 4.5V (approx. 900°C).
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.
- 1Check the exhaust gas temperature sensor wiring and connectors for damage or corrosion.
- 2Disconnect the sensor and measure the resistance of the sensor; typical range is about 200 to 500 ohms at ambient temperature.
- 3Recheck the voltage at the sensor harness while the engine is running; it should be between 0.5V and 4.5V. If it's below 0.2V, proceed to the next step.
- 4Inspect the sensor with a scan tool to confirm if any wiring issues are detected. If the wiring is good, replace the sensor.
Common causes
- Damaged sensor
- Faulty wiring or connectors
- Corrosion at the connector
- Engine coolant leaking onto the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable, but exhaust temperatures could be affected, potentially leading to damage over time.
Will this code come back after reset?
If the underlying issue isn't fixed, yes, the code will likely return.
Why is this code paired with others?
Multiple temperature sensors may share wiring, so a fault in one can affect readings on others.
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