Exhaust Gas Temperature Sensor 2
Error with the second exhaust gas temperature sensor signal.
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What it means (plain English)
The exhaust gas temperature sensor 2 is either malfunctioning or sending the wrong signal to the engine control unit (ECU).
What the computer is actually seeing
The ECU detects irregular voltage values from the exhaust gas temperature sensor 2. It expects a voltage in the range of 0.5V to 4.5V. If the voltage stays either below 0.5V or above 4.5V for a specified duration (about 5 seconds), it triggers the fault code.
What a healthy reading looks like
Normal operation should see sensor voltage fluctuate between 0.5V to 4.5V based on exhaust gas temperature, which can range from 200°C to 800°C depending on load and engine conditions.
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. Inspect the exhaust gas temperature sensor 2 wiring and connector for damage, corrosion, or loose connections. If found, repair or replace as necessary.
- 22. Check the resistance of the exhaust gas temperature sensor 2 at room temperature, it should be between 200-400 ohms. If out of range, replace the sensor.
- 33. Use a scan tool to read the live data from the exhaust gas temperature sensor 2 while the engine is running. It should vary with engine temperature. If it’s static, suspect a faulty sensor.
- 44. If the sensor readings are erratic or out of range, replace the exhaust gas temperature sensor 2 and clear the fault codes.
- 55. After replacement, perform a test drive to confirm if the code returns.
Common causes
- Faulty exhaust gas temperature sensor 2
- Wiring issues or frayed wires
- Corroded connectors
- Software glitches in the ECM/PCM
- Exhaust leaks affecting sensor performance
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s drivable, but the engine may execute derate strategies if temperatures remain uncontrolled, leading to performance issues.
Will the code come back after repairs?
If the underlying issue is fixed and the new parts are functioning correctly, the code should not return.
Why does this code pair with other codes?
This code often pairs with other exhaust temperature or sensor codes due to systemic issues in the exhaust system affecting multiple sensors.
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