Intake Air Temperature Sensor 1
Intake Air Temperature Sensor 1 signal is out of range.
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What it means (plain English)
The engine computer measures the temperature of the air entering the engine. If this temperature is too high or low, it can affect engine performance and emissions.
What the computer is actually seeing
The engine control module (ECM) expects the intake air temperature to be within a certain range based on ambient conditions and engine operation. A voltage signal from the sensor that is too high or too low will trigger this fault.
What a healthy reading looks like
The expected range for the intake air temperature is typically between -40°F to 240°F (-40°C to 116°C). Any values outside this range will trigger a fault code.
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 intake air temperature sensor wiring harness for damage or loose connections. Repair as necessary. Decision: If wiring is good, go to step 2. If wiring is bad, repair and retest.
- 22. Check the resistance of the intake air temperature sensor at two temperatures (ambient and heated). It should change resistance appropriately. Decision: If resistance is within specification, go to step 3. If it’s out, replace the sensor.
- 33. Monitor the live data for intake air temperature while the engine runs. If the reading is fluctuating erratically or out of range, replace the intake air temperature sensor.
Common causes
- Faulty intake air temperature sensor
- Wiring issues or poor connections at the sensor
- Intake manifold leaks causing incorrect air readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix this soon as it affects fuel efficiency and emissions. It may not cause immediate drivability issues, but performance can suffer.
Will this code come back after clearing?
If the underlying issue is not fixed, the code is likely to return after clearing.
Why does this code pair with P0112 or P0113?
These codes also relate to intake air temperature sensor malfunctions, indicating high or low input issues.
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