Exhaust Gas Temperature Sensor 2 Circuit
This code indicates a problem with the second exhaust gas temperature sensor's circuit.
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 computer measures the exhaust temperature through the second sensor. If it sees values that are too low or too high for a certain amount of time, it triggers this code, meaning something is wrong with that sensor or its wiring.
What the computer is actually seeing
The engine control unit (ECU) expects the second exhaust gas temperature sensor to output a voltage between 0.5V to 4.5V, which corresponds to temperatures roughly between 300°F and 1,200°F. If the readings are out of this range or fluctuating too wildly, it will set the code.
What a healthy reading looks like
Expected voltage from the sensor should be between 0.5V and 4.5V; normal operating temperature signals would be 300°F to 1,200°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.
- 1Check the wiring and connectors of the exhaust gas temperature sensor 2 for damage or corrosion.
- 2Test the voltage at the sensor's connector while the engine runs. It should read between 0.5V and 4.5V. If it’s out of range, proceed to the next step.
- 3Inspect the exhaust system for leaks near the sensor, as this can affect readings. Repair any leaks found.
- 4If wiring and sensor check out, replace the second exhaust gas temperature sensor.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or bad connectors
- Exhaust leaks affecting sensor performance
- Short circuits or open circuits in the sensor circuit
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix this issue soon as it can affect emissions and engine performance.
Will the code come back after clearing it?
If the underlying issue isn't fixed, the code will likely reappear.
Why does this code pair with SPN 3471?
Both codes relate to temperature sensors in the exhaust system, and issues with one can affect the other.
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