Exhaust Gas Temperature Sensor Range/Performance Problem
Issue with exhaust gas temperature sensor functionality.
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What it means (plain English)
The exhaust gas temperature sensor is reading values that are outside its normal operating range, which could indicate either a faulty sensor or issues with the exhaust system that affect temperature readings.
What the computer is actually seeing
The engine control module (ECM) notices a significant difference in temperature readings from the exhaust gas temperature sensor compared to expected values based on engine operation, indicating a malfunction.
What a healthy reading looks like
Normal operating range for exhaust gas temperature should be approximately 300°C to 800°C under typical operation conditions, depending on load and engine tuning.
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 wiring and connectors for the exhaust gas temperature sensor. Look for frayed wires or loose connections.
- 22. Measure the resistance of the exhaust gas temperature sensor at room temperature; it should be around 2.5 to 3.5 ohms. If not, replace the sensor.
- 33. Start the engine and monitor the exhaust gas temperature readings with a scan tool. If it's outside the expected range under normal operating conditions, consider replacing the sensor.
- 44. If the sensor is good, check for exhaust leaks or restrictions. Use a smoke test or visual inspection for leaks.
- 55. Finally, check the ECM for any software updates or faults that may affect sensor readings. If all else checks out, consider updating or replacing the ECM.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or short circuits in the sensor harness
- Exhaust leaks or restrictions affecting gas flow and temperature
- Defective engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is drivable but recommend fixing soon as it may affect emissions and performance.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with P208C?
Both codes indicate issues with the exhaust gas temperature sensors, which can be linked to the same failure source or system.
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