Exhaust Gas Temperature Sensor 1
The sensor reading for exhaust gas temperature 1 is out of range.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the gases are coming out of the engine. If it's reading too high or too low, it might be faulty or there might be an issue with the exhaust system.
What the computer is actually seeing
The engine control module (ECM) sees a voltage signal from the exhaust gas temperature sensor that indicates the exhaust temperature. A reading outside of the normal range (typically between 0.5 to 4.5 volts) triggers this fault code.
What a healthy reading looks like
Normal operating range for exhaust gas temperature sensor output is generally 0.5 to 4.5 volts. Corresponding temperatures can range anywhere from 200°F to 1500°F depending on the application.
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 connector for the exhaust gas temperature sensor for any signs of damage or corrosion. If damaged, repair or replace as needed. Decision: If wiring is intact, proceed to step 2.
- 22. Measure the voltage output from the exhaust gas temperature sensor using a multimeter. Expected value is between 0.5 to 4.5 volts. Decision: If out of range, replace the sensor. If within range, proceed to step 3.
- 33. Check for exhaust leaks downstream of the sensor. If leaks are found, repair them and recheck the code. Decision: If no leaks and code persists, proceed to step 4.
- 44. Clear the code and perform a road test to see if it returns. Decision: If the code returns, replace the ECM or review for programming issues if all else fails.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or poor connections
- Exhaust leaks
- ECM programming error
- Contaminated or damaged sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but you might notice performance issues or reduced efficiency. Fix it soon.
Will this code come back?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code pair with SPN 232?
SPN 232 typically indicates a problem with a related temperature sensor, so issues with exhaust temperatures often affect both.
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