Engine Exhaust Temperature Sensor 1
Indicates an issue with the engine exhaust temperature sensor 1.
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 engine exhaust temperature sensor 1 measures the temperature of the exhaust gases coming out of the engine. If it reads too high or too low, the ECM thinks something is wrong with the exhaust system or the sensor itself.
What the computer is actually seeing
The ECM expects the exhaust temperature to be within a range typical for the engine's operating condition, usually between 300°F to 1200°F (about 149°C to 649°C).
What a healthy reading looks like
Exhaust temp should stay between 300°F to 1200°F under normal conditions; anything outside this range could trigger a fault.
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 exhaust temperature sensor wiring for any visible damage or breakage.
- 2Inspect the connector for corrosion or gapping; clean or repair as necessary.
- 3Measure resistance of the exhaust temperature sensor at room temp (should be around 2-4 Ohms) and then at operating temp; compare with service manual specs.
- 4If wiring and connection are good, replace the exhaust temperature sensor, then clear codes and retest.
Common causes
- Wiring issues between the sensor and ECM (breaks, shorts)
- Faulty exhaust temperature sensor 1
- Exhaust leaks affecting temperature reading
- Poor electrical connection at sensor or ECM
Typical repair cost
$$$ (200-600)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive but should address it soon to avoid potential issues with performance.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, it will likely return.
Why do I see this code with other exhaust temperature codes?
This often happens because the sensors monitor different locations and failures can affect multiple sensors.
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