Exhaust Gas Temperature Sensor 2 - Circuit High
The exhaust gas temperature sensor circuit is reading a high voltage.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are. When it reads too high, it means there's likely a problem with the sensor itself or its wiring.
What the computer is actually seeing
The sensor typically sends a signal voltage between 0.5V to 1.5V based on temperature, and a voltage above this range (usually above 2.5V) will trigger this fault code.
What a healthy reading looks like
Expected voltage from the sensor should be between 0.5V to 1.5V; if it exceeds 2.5V, this code will set.
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 signs of damage or corrosion. Is wiring intact? If not, repair or replace wiring/connectors.
- 22. Check the resistance of the exhaust gas temperature sensor (should be within manufacturer specs, typically a few ohms to tens of ohms depending on temperature). Is the sensor within spec? If not, replace the sensor.
- 33. Measure the signal voltage at the sensor connector with the engine running at idle. Is voltage within 0.5V to 1.5V? If above 2.5V, suspect a wiring issue or short, clean the circuit or replace components as needed.
Common causes
- Faulty exhaust gas temperature sensor
- Shorted wiring or connector
- Open circuit in the sensor circuit
- Overheating issues in the exhaust system
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but fix it soon to prevent potential engine performance issues.
Will the code come back after clearing it?
If the underlying issue isn't repaired, yes, it will likely return.
Why does this code appear with SPN 1724?
Both codes are related to exhaust temperature sensor readings and can indicate either multiple sensor issues or wiring problems.
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