Engine Exhaust Temperature Sensor 2
This code refers to an issue with the second engine exhaust 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)
The engine has multiple temperature sensors in the exhaust system. When the second sensor (usually found near the turbo or DPF) reports an abnormal temperature, this code triggers.
What the computer is actually seeing
The engine control unit (ECU) sees a maximum or minimum voltage from the exhaust temperature sensor outside the expected range, typically higher than 4.9 volts or lower than 0.2 volts.
What a healthy reading looks like
The expected voltage range for a functioning exhaust temperature sensor is between 0.2 to 4.9 volts, correlating to temperatures of approximately 300°F to 1600°F.
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. Check the wiring harness and connector for exhaust temperature sensor 2 for visible damage or corrosion. Repair as needed.
- 22. Measure the voltage at the exhaust temperature sensor connector with the key on, engine off. You should see between 0.2 and 4.9 volts. If out of range, proceed.
- 33. If voltage is out of range, disconnect the sensor and check resistance across the sensor terminals. You should see a resistance that varies with temperature. Replace the sensor if it reads open or shorted.
- 44. If sensor checks out, inspect the wiring for continuity and shorts to ground or battery. Repair any faults found in the wiring.
- 55. Reconnect the sensor and perform a road test. Use a scan tool to clear the fault code and observe if it returns. If so, consider checking ECU data and software.
Common causes
- Faulty exhaust temperature sensor 2
- Wiring or connector issues leading to open/short circuit
- Contaminated sensor harness due to exhaust leaks
- Corrosion on connectors
- ECU software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive, but the exhaust system may be damaging or performance may be affected. Fix it soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code pair with other SPN codes?
Codes can pair due to related systems malfunctioning; for example, a faulty sensor could trigger multiple codes across exhaust monitoring.
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