Active Exhaust Gas Temperature Sensor 1
There's a fault with the exhaust gas temperature sensor 1 signal.
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What it means (plain English)
The computer is getting a signal from the exhaust gas temperature sensor that doesn’t match expectations, which means the sensor could be faulty or the wiring might be damaged.
What the computer is actually seeing
The engine control unit (ECU) sees voltage levels from the exhaust gas temperature sensor that exceed the normal range, typically above 4.5V or below 0.5V under normal conditions.
What a healthy reading looks like
Expected voltage from the sensor should range from 0.5V to 4.5V based on exhaust temperature, indicating temperatures from approximately 100°C to 700°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. Inspect the wiring and connectors to the exhaust gas temperature sensor for damage or corrosion. Is everything intact? If no, repair the wire/connectors as needed.
- 22. Use a multimeter to test the voltage output of the exhaust gas temperature sensor. Does it fall within the expected range (0.5V - 4.5V)? If no, replace the sensor.
- 33. Check for exhaust leaks around the sensor installation area. Are there any leaks? If yes, repair the leaks and retest the sensor output.
Common causes
- Faulty exhaust gas temperature sensor
- Damaged wiring or connectors to the sensor
- Exhaust leak affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this fault code?
It's drivable, but you should fix it soon to prevent possible damage to engine components.
Will this code come back after clearing?
If the underlying issue is not fixed, it will likely return after driving for a short period.
Why does this code sometimes pair with other codes?
This can happen because multiple sensors and components can be affected by the same wiring issue or a common fault, triggering several codes.
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