Engine Intake Air Temperature Sensor 1 Circuit High
The engine's intake air temperature sensor is reporting a high voltage or temperature indication.
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What it means (plain English)
The computer sees that the intake air temperature sensor is sending a signal that's too high, meaning it thinks the air entering the engine is much hotter than it really is.
What the computer is actually seeing
The ECU expects the intake air temperature (IAT) to usually be between -40°C to 125°C (-40°F to 257°F). A reading above this range indicates a fault.
What a healthy reading looks like
Expected IAT readings are generally between -40°C and 125°C (-40°F to 257°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 IAT sensor wiring for damage or corrosion. Is the wiring intact? If YES, go to step 2. If NO, repair the wiring.
- 22. Check the electrical connector of the IAT sensor for corrosion or loose terminals. Is the connection solid? If YES, go to step 3. If NO, repair or replace the connector.
- 33. With the vehicle warmed up, use a scan tool to monitor the IAT reading. Is the temperature within the expected range? If YES, check for other codes. If NO, replace the IAT sensor.
Common causes
- Faulty intake air temperature sensor
- Wiring short or open circuit to the sensor
- Connector corrosion or poor connection
- Air intake obstruction or extreme environmental conditions
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive but you may experience reduced performance until it's fixed.
Will this code come back after resetting?
If the underlying issue isn't resolved, yes, it will return.
Why does this code pair with low power codes?
A faulty IAT sensor can lead to incorrect air-fuel mixture, causing power loss.
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