EGR Temperature Sensor 1 (High Temperature)
EGR temperature sensor is reporting a high temperature.
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What it means (plain English)
The exhaust gas recirculation (EGR) temperature sensor is detecting that the temperature of the exhaust gases returning to the intake is too high, which can cause engine performance issues and increased emissions.
What the computer is actually seeing
The EGR temperature sensor measures the temperature of the exhaust gases. It sends a voltage signal that varies from about 0.5V (low temp) to 4.5V (high temp) back to the ECU. When the voltage exceeds the set threshold (usually around 4.0V), the fault code is triggered.
What a healthy reading looks like
Normal EGR temperature readings are typically between 150°F to 400°F (65°C to 200°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 for exhaust leaks around the EGR system; repair if found.
- 22. Inspect the wiring and connector for the EGR temperature sensor; ensure they are secure and not damaged.
- 33. Measure the voltage output of the EGR temperature sensor at idle; it should be between 0.5V and 4.5V. If it exceeds 4.0V, proceed to step 4.
- 44. Check the EGR cooler for any coolant leaks; fix any leaks present.
- 55. If all is clear, replace the EGR temperature sensor and clear the code.
Common causes
- Faulty EGR temperature sensor
- Exhaust leaks near the EGR system
- Wiring issues or shorts in the sensor circuit
- Coolant leaks affecting the EGR cooler
- Engine overheating issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to get it checked soon; it may cause reduced performance or increased emissions.
Will this code come back after repair?
If all underlying issues are fixed properly, the code should not return.
Why do I see this code with SPN 701?
SPN 701 indicates low temperature; SPN 702 indicates high temperature, often due to the same sensor failing or a fault in the EGR system.
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