Exhaust Gas Temperature Sensor 1 (EGT1) High
The Exhaust Gas Temperature Sensor 1 is reading a temperature higher than normal.
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What it means (plain English)
The exhaust gas temperature sensor is telling the computer that the exhaust is hotter than expected, usually over 800°F (427°C). This can happen due to a faulty sensor or engine issues leading to excessive heat.
What the computer is actually seeing
The engine control module (ECM) is seeing a voltage from the EGT1 sensor that exceeds its normal range, typically over 4.5 volts, indicating an over-temperature condition.
What a healthy reading looks like
For a functioning EGT sensor, expected voltage should be between 0.5 and 2.5 volts under normal operating conditions, with temperature readings typically around 500-800°F (260-427°C) when the engine is running.
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 the exhaust gas temperature sensor connector and wiring for damage or corrosion. Repair as necessary.
- 2Inspect the exhaust system for leaks. Repair or replace exhaust components if leaks are found.
- 3Use a scan tool to check the live data from the EGT1 sensor. Ensure voltage readings are within expected values.
- 4If the sensor readings are outside of expected values, replace the EGT sensor and retest.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or corrosion in the sensor circuit
- Exhaust system leaks causing incorrect readings
- Engine running too rich, causing high exhaust temperatures
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive with this code as high exhaust temperatures can lead to further engine damage.
Will this fault code return after fixing?
If the wiring and sensor are repaired or replaced correctly, the code should not return.
Why does this code often appear with other codes?
This code may appear with others due to shared wiring or common causes affecting the engine and exhaust system.
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