Exhaust Gas Temperature Sensor 2 - Input Below Normal
The exhaust gas temperature sensor 2 is reporting a low voltage signal.
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What it means (plain English)
Inside your engine's exhaust system, there are temperature sensors that help monitor how hot the exhaust gases are. If the second sensor is showing a voltage drop below 0.2 volts when it should be higher (typically around 0.5 to 4.5 volts), that's a sign it might be faulty or there's a wiring issue.
What the computer is actually seeing
The engine control unit (ECU) sees a voltage from the exhaust gas temperature sensor 2 well below the expected range, indicating an issue with the sensor or the wiring.
What a healthy reading looks like
Expected output is typically between 0.5V to 4.5V depending on exhaust temperature; below 0.2V indicates a problem.
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 leading to exhaust gas temperature sensor 2. Look for fraying, corrosion, or loose connections. Decision: If found damaged, repair wiring; if good, proceed.
- 22. Using a multimeter, check the voltage output of exhaust gas temperature sensor 2 while the engine is running. Expected: 0.5V - 4.5V. Decision: If below 0.2V, replace the sensor; if within range, check ECU input.
- 33. Clear the code and run the vehicle to see if the code returns. Decision: If it comes back, suspect further electrical issues or ECU malfunction.
Common causes
- Wiring damage or corrosion
- Faulty exhaust gas temperature sensor
- Connector issues at the sensor or ECU
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive the vehicle with this code?
It's moderate severity; you can drive it short distances but should fix it soon to avoid potential engine damage.
Will this code come back after clearing?
Yes, if the underlying issue isn't addressed, the code will likely return.
Why is this code paired with other EGT codes?
Multiple EGT sensors work in tandem; issues with one can lead to faults in others, indicating a systemic problem.
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