Exhaust Gas Temperature Sensor Out of Range
The exhaust gas temperature sensor is reporting temperatures outside of normal range.
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What it means (plain English)
The exhaust gas temperature sensor is measuring temperatures either too high or too low to be accurate, making the engine control unit think there's a problem with the exhaust system.
What the computer is actually seeing
The engine control unit expects the exhaust gas temperature to be between 300°F and 1200°F (approximately 150°C to 650°C) under normal operating conditions. When readings fall outside this range, it triggers the fault code.
What a healthy reading looks like
Normal exhaust gas temperature readings should be between 300°F to 1200°F (150°C to 650°C).
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 sensor wiring harness and connectors for damage or corrosion. Repair or replace as necessary. Decision point: If wiring is intact, proceed to step 2.
- 22. Measure the exhaust gas temperature at the sensor output using a digital multimeter. It should read approximately 0.5V at 300°F and 2.5V at 1200°F. Decision point: If readings are correct, replace the sensor; if incorrect, inspect the exhaust system for leaks or other issues.
- 33. Verify the exhaust gas temperature under normal engine operating conditions. If temperatures exceed the expected values due to coolant issues or exhaust leaks, address those issues before replacing the sensor.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues (shorts or opens)
- Connector corrosion or damage
- Exhaust leaks
- Engine coolant issues affecting overall temperature
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this fault?
Yes, but limit driving until diagnosed, as it may affect emissions.
Will this code come back after fixing?
If the issue is resolved properly, the code should not return.
Why do I see this code with SPN 5784?
They both relate to exhaust gas temperature issues, often tied to the same sensor.
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