Exhaust Gas Temperature Sensor 1
The exhaust gas temperature sensor 1 is reporting an out-of-range value.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are. If it reports a temperature that's too high or too low, it could mean there's a problem with the sensor or the exhaust system.
What the computer is actually seeing
The engine control module (ECM) is receiving a temperature reading that is above 1200°F (649°C) or below 200°F (93°C) from the exhaust gas temperature sensor.
What a healthy reading looks like
Expected values should range from 200°F (93°C) during cold start to no more than 1200°F (649°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.
- 11. Check the wiring and connectors for the exhaust gas temperature sensor. Look for damage or corrosion.
- 22. Inspect for exhaust leaks near the sensor. A leak can skew temperature readings.
- 33. Using a scan tool, read the live data from the exhaust gas temperature sensor. Does it show values within the expected range?
- 44. If the values are out of range, replace the exhaust gas temperature sensor and recheck values.
- 55. If values are normal after sensor replacement but the code reappears, check the ECM for faults or recalibrate if necessary.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues (shorts or opens)
- Exhaust leaks affecting temperature readings
- Contaminated or corroded connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It’s best to avoid driving with this code. While it may be drivable, overheating exhaust can lead to additional damage.
Will this code come back if I clear it?
If the underlying issue isn't fixed, the code will likely return after clearing.
Why does this code pair with other exhaust codes?
Codes often relate due to shared components; for example, if the temperature is incorrect, it could influence other emission-related sensors.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →