Engine Intake Air Temp Sensor 1
Indicates a problem with the Engine Intake Air Temperature sensor reading.
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What it means (plain English)
The engine's computer uses the intake air temperature to adjust fuel delivery for optimal performance. If the temperature reading is too low or too high, the engine can't run properly.
What the computer is actually seeing
The Engine Control Unit (ECU) expects a voltage signal from the intake air temperature sensor that varies between 0.5V (at -40°C) to around 4.5V (at 125°C).
What a healthy reading looks like
Intake air temp should be between -40°C to 125°C; voltages from the sensor should range from 0.5V to 4.5V.
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 at the intake air temperature sensor for damage or corrosion. Fix any issues found.
- 22. Measure the voltage at the sensor connector with the engine running. You should see a value between 0.5V and 4.5V. If not, replace the sensor.
- 33. If voltage is correct, use a scan tool to check for additional logged codes that may relate to intake air flow or temperature.
- 44. Check intake air flow for blockages; ensure the air filter is clean and the intake system is not obstructed.
- 55. Clear the code and run the vehicle to see if the code returns.
Common causes
- Faulty intake air temperature sensor
- Wiring issues or damaged connectors to the sensor
- ECU software issues
- Blockage in intake air flow
- Vacuum leaks affecting readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; driving is possible but performance may suffer.
Will this code come back after fixing?
If the repair is done properly, the code should not return.
Why does this code pair with others?
It's common for multiple sensors to fail or be affected by the same issues like wiring harness problems.
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