Intake Air Temperature Sensor 1 Out of Range
The intake air temperature sensor is reporting values outside of the normal operating range.
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What it means (plain English)
The sensor that checks the temperature of the air entering the engine is either too high or too low. This can cause poor performance and increased emissions because the engine computer can't adjust properly for temperature.
What the computer is actually seeing
The engine control module (ECM) is designed to see intake air temperature between -40°F and 212°F (-40°C to 100°C). If it reads below or above these values, it'll trigger the code.
What a healthy reading looks like
Expect the intake air temperature to be within normal parameters during operation, typically between 40°F and 160°F (4°C to 71°C).
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 connector for the intake air temperature sensor for any damage or corrosion. (Decision: Repair any issues found or proceed to step 2)
- 2Use a scan tool to monitor the intake air temperature sensor reading. Are the values within normal range? (Decision: If yes, check sensor installation; if no, proceed to step 3)
- 3Test the resistance of the sensor at various temperatures. At room temp (around 70°F), you should see around 2.5k ohms. (Decision: If resistance is out of spec, replace the sensor; if normal, inspect ECM for issues)
- 4Inspect the air intake system for any leaks or obstructions. (Decision: Repair any leaks or clear obstructions; if none found, consider further diagnosing the ECM)
Common causes
- Faulty intake air temperature sensor
- Wiring issues or poor connections
- Air intake system leaks or obstructions
- Faulty engine control module (ECM)
- Improper installation of the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's safe to drive for a short time, but expect reduced performance and increased emissions. Fix it soon.
Will this code come back after clearing it?
If the underlying issue is not resolved, yes, it will return after a short period.
Why does this code sometimes pair with other codes?
If multiple sensors are affected or there are related issues in the air intake system, multiple codes can be triggered.
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