Temperature Sensor Failure - Exhaust Gas Temperature (EGT) Sensor 2
Issue with the second EGT sensor in the exhaust system.
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What it means (plain English)
The ECM is getting bad data from the second exhaust gas temperature sensor, which can affect the engine's performance and emissions control.
What the computer is actually seeing
The engine control module (ECM) expects the EGT to be within a certain temperature range, typically between 300°F to 1,500°F. If it reads out of this range or remains constant too long, it sets this code.
What a healthy reading looks like
EGT readings should vary between 300°F and 1,500°F, depending on engine load and operating conditions.
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 EGT sensor for damage or corrosion. If found, repair the wiring or connections.
- 22. Check the exhaust system for leaks near the second EGT sensor. Seal any leaks found.
- 33. Test the EGT sensor using a multimeter. Check the resistance; it should be within the manufacturer's specification, typically around 5 ohms at room temperature.
- 44. If the sensor is out of spec, replace the EGT sensor and clear the code.
- 55. After replacement, take the vehicle for a drive under various loads to monitor EGT readings and ensure the code does not return.
Common causes
- Faulty EGT sensor
- Wiring or connector issues
- Exhaust leaks near sensor
- Contaminated or corroded sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s moderate severity; you can drive but should address it soon to prevent emission issues.
Will this code come back after clearing?
If the sensor or wiring isn't the issue, it can return after clearing.
Why does this code appear with SPN 456 and 457?
These codes relate to similar exhaust temperature readings, indicating potential correlated sensor issues.
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