Engine Exhaust Temperature Sensor Circuit (Bank 1)
Indicates an issue with the temperature sensor circuit associated with the engine exhaust.
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What it means (plain English)
The engine's computer is not getting the right temperature reading from the exhaust temperature sensor, which can mess with engine performance and emissions.
What the computer is actually seeing
The ECM is expecting a voltage signal from the exhaust temperature sensor that fluctuates between 0.5V (around 300°F) to 4.5V (around 1800°F), depending on actual exhaust temperature. If the voltage is outside this range or completely missing, it throws the fault code.
What a healthy reading looks like
0.5V to 4.5V from the exhaust temperature sensor based on temperature; normal readings reflect exhaust temperatures between 300°F and 1800°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 and connectors going to the exhaust temperature sensor for damage or corrosion.
- 22. With the key on (engine off), measure the voltage at the sensor connector. You should see a voltage between 0.5V and 4.5V. If out of range, check wiring integrity and grounds.
- 33. If the wiring checks out, unplug the exhaust temperature sensor and measure its resistance. Compare it to the manufacturer specifications, typically 5-10k ohms at room temperature.
- 44. Replace the exhaust temperature sensor if all tests indicate a failure and you've ruled out wiring issues.
Common causes
- Open circuit in the wiring
- Short circuit to ground or power
- Failed exhaust temperature sensor
- Poor connection at the sensor or wiring harness
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Moderate severity means you should fix it soon. It may impact emissions and performance.
Will this code come back after clearing?
If the problem isn't fixed (e.g., bad sensor or wiring), yes, the code will likely reappear.
Why does this code pair with others?
Codes are often linked; for example, a failed sensor might affect multiple systems or be part of a chain of faults.
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