Exhaust Gas Temperature Sensor 1 Circuit High
The exhaust gas temperature sensor is reporting a high voltage anomaly.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are as they're released from the engine. If the reading is too high, it could indicate the sensor is malfunctioning or there's a wiring issue.
What the computer is actually seeing
The engine control unit (ECU) expects a voltage signal typically between 0.5V and 1.5V from the exhaust gas temperature sensor. A voltage above this range indicates a fault.
What a healthy reading looks like
Normal operating voltage for the exhaust gas temperature sensor should be between 0.5V (cold) and 1.5V (operating temperature).
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 gas temperature sensor wiring for damage or shorts. Repair any issues found.
- 2Inspect connectors at the exhaust gas temperature sensor and ECM for corrosion or loose connections. Fix as necessary.
- 3Test the exhaust gas temperature sensor with a multimeter. Measure the voltage during engine operation. Is it above 1.5V? If yes, replace the sensor.
- 4If the voltage is within normal range, check the ECM for fault codes related to other sensors, as issues might be linked.
Common causes
- Shorted wire in the sensor circuit
- Faulty exhaust gas temperature sensor
- Open circuit in the wiring harness
- Poor electrical connection at the sensor or ECM connector
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
It's drivable but you should address the issue soon, as prolonged high exhaust gas temperatures can damage engine components.
Will this code come back after replacing the sensor?
If the sensor replacement is successful and no wiring issues exist, the code should not return.
Why might this code appear with other codes?
Sharing similar circuits or systems can trigger multiple codes, especially if there's an electrical issue affecting more than one sensor.
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