Exhaust Gas Temperature Sensor 3 Circuit Low
The exhaust gas temperature sensor 3 circuit is reading lower than expected value.
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What it means (plain English)
The sensor that's meant to measure the temperature of the exhaust gases is sending a signal that it's too low, which means something's wrong with the sensor or its wiring.
What the computer is actually seeing
The engine control module (ECM) sees that the voltage from the exhaust gas temperature sensor 3 drops below a threshold of around 0.1 volts when it should be between 0.5 to 4.5 volts during normal operation.
What a healthy reading looks like
0.5 to 4.5 volts under normal conditions; ideally around 1.5 to 2.5 volts during normal operation when the engine is warm.
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 of exhaust gas temperature sensor 3. Look for frays, corrosion, or loose connections. Are there visible issues? If yes, repair/replace as needed and retest. If no, proceed to step 2.
- 22. Measure the voltage at the exhaust gas temperature sensor 3 connector with the engine running. Is the voltage within expected values (0.5 to 4.5 volts)? If yes, suspect an ECM issue. If no, proceed to step 3.
- 33. Replace the exhaust gas temperature sensor 3. Did the code clear after replacement and the vehicle runs smoothly? If yes, the issue is resolved. If no, proceed to step 4.
- 44. Check for exhaust system leaks between the sensor and the engine. Are there any leaks? If yes, repair the leaks and retest. If no, consider possible ECM reprogramming.
Common causes
- Faulty exhaust gas temperature sensor 3
- Wiring issues or corrosion in the sensor circuit
- Connector problems or poor contact
- Exhaust system leaks affecting sensor readings
- ECM software issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
While the vehicle may drive normally, it's advisable to address the code soon to avoid potential emissions issues or increased fuel consumption.
Will this code come back after clearing it?
If the underlying issue isn't fixed (like a bad sensor or poor wiring), it will likely return.
Why does this code pair with other SPNs?
It's common for exhaust system sensors to affect each other; if one is malfunctioning, it can cause others to trigger faults.
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