Exhaust Gas Temperature Sensor 2 Circuit High
This code indicates a high voltage reading from the second exhaust gas temperature sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
Your vehicle has a sensor that measures how hot the exhaust gases are coming out. If this sensor sends back a high voltage, it could mean it's either faulty, there's a wiring issue, or the exhaust is too hot.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the voltage signal from the exhaust gas temperature sensor. If the voltage exceeds a certain threshold, typically above 5 volts, it triggers the fault code.
What a healthy reading looks like
Normal voltage values from the sensor should be between 0.5 to 4.5 volts under normal operating conditions, correlating to temperatures from approximately 250°F to 1,300°F (121°C to 704°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 at the exhaust gas temperature sensor 2 for damage or corrosion. If any issues are found, repair as needed.
- 22. Measure the voltage at the exhaust gas temperature sensor 2 connector with the engine running. It should be between 0.5 and 4.5 volts. If above 5 volts, proceed to step 3. If within range, consider replacing the sensor.
- 33. Check the ground circuit for the sensor to ensure it is properly connected and functional. If grounding is poor, repair it and retest. If good, replace the sensor.
Common causes
- Faulty exhaust gas temperature sensor 2
- Wiring issues (short circuit or open circuit)
- Poor connections at the sensor or ECU
- Exhaust system issues leading to overheating
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but get it checked out soon to avoid potential overheating issues.
Will this code return after clearing it?
It may return if the underlying issue isn't fixed. Monitor the situation closely.
Why does this code sometimes pair with P0138?
P0138 indicates a similar high voltage issue, just with a different oxygen sensor, and they may arise from shared wiring or system errors.
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