Engine Exhaust Temperature Sensor 1
The engine exhaust temperature sensor 1 is reading outside normal ranges.
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What it means (plain English)
The engine has a sensor that measures how hot the exhaust gases are. If this sensor goes out of range, it signals there might be an issue with the engine or the sensor itself.
What the computer is actually seeing
The ECM sees a voltage signal from the exhaust temperature sensor that is too high or too low. Normally, you expect a voltage of about 0.5 to 1.5 volts when the exhaust temperature is within acceptable limits.
What a healthy reading looks like
Voltage should range between 0.5 to 1.5 volts; temperatures should be around 300-800°F (150-425°C) during normal operation.
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 wiring and connectors of the exhaust temperature sensor for damage or corrosion.
- 2Measure the voltage at the exhaust temperature sensor connector with the engine running, expecting 0.5 to 1.5 volts. If out of range, replace the sensor.
- 3Inspect for any exhaust leaks near the sensor that could affect readings. Repair if necessary.
- 4Clear the code and conduct a road test. If the code returns immediately, replace the exhaust temperature sensor.
Common causes
- Faulty exhaust temperature sensor
- Wiring issues, such as frayed or broken wires
- Poor electrical connection or corroded connectors
- Exhaust leaks affecting sensor readings
- ECM calibration issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but monitor performance and fix it soon to prevent further issues.
Will this code come back after clearing it?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does this code pair with SPN 1576?
SPN 1576 relates to a similar sensor or circuit issue, indicating multiple related problems.
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