Inlet Air Temperature Sensor 1 Condition
The engine control module detected a fault in the inlet air temperature sensor reading.
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What it means (plain English)
The engine's computer is saying the temperature reading from the air sensor doesn't match expectations, which can affect performance and efficiency.
What the computer is actually seeing
The temperature reading from the inlet air temperature sensor is outside of normal operating range, typically below -40°C (-40°F) or above 125°C (257°F).
What a healthy reading looks like
Inlet air temperature should be between -40°C and 125°C (-40°F to 257°F); normal operating temperatures are typically around 15°C to 35°C (59°F to 95°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. Inspect the wiring and connectors to the inlet air temperature sensor for damage or corrosion. If they're damaged, repair or replace as needed.
- 22. Use a scan tool to read the inlet air temperature sensor values. Compare reading to the expected values. If outside of normal range, proceed to next step.
- 33. Test the inlet air temperature sensor with a multimeter. It should show resistance changes correlating with temperature. If it doesn't, replace the sensor.
- 44. Check for any intake air leaks. Use a smoke test if necessary. Seal leaks as needed and retest.
- 55. If all previous checks are good and the fault persists, consider recalibrating the engine control module if applicable.
Common causes
- Faulty inlet air temperature sensor
- Wiring issues or bad connectors
- Intake air leaks
- Incorrect calibration of the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive, but it's advised to fix it soon to avoid performance issues.
What if the code comes back after repairs?
If the code returns, there may be an underlying issue not resolved, such as a wiring problem or a faulty ECM.
Why does this code sometimes pair with SPN 2209?
SPN 2209 indicates a fault in the air flow sensor, which can occur alongside inlet air temperature sensor issues due to shared air intake pathways.
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