Engine Intake Air Temperature Sensor 1 Low
The engine's intake air temperature sensor is reporting a voltage that indicates a low temperature.
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What it means (plain English)
The sensor that measures how hot or cold the air going into the engine is showing a temperature that’s too low, which may not give a proper reading for the engine management system.
What the computer is actually seeing
The engine control unit (ECU) expects the intake air temperature to be between 10°C and 100°C. If the voltage from the sensor falls below 0.1V or there’s an open circuit, it interprets this as a low temperature condition.
What a healthy reading looks like
Intake air temperature should typically range from 5°C to 60°C during normal operation; below 0°C indicates a failure or malfunction.
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 signs of damage or corrosion. Repair any issues found.
- 2Measure the voltage at the intake air temperature sensor connector while the engine is running. Expected voltage should be between 0.5V and 4.5V based on temperature.
- 3If the voltage is outside this range, disconnect the sensor and measure the resistance of the sensor at various temperatures. It should match manufacturer specifications.
- 4If the sensor is faulty, replace it and clear the codes. If the issue persists, inspect the ECU and its wiring.
Common causes
- Failed intake air temperature sensor
- Wiring issues such as broken or shorted wires
- Faulty ECU internal processing issues
- Contamination or physical obstruction of the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's generally safe to drive, but performance and emissions may be affected.
Will this code come back after I clear it?
If the underlying issue isn’t fixed, likely yes.
Why does this code appear with other codes?
It often pairs with other sensor malfunctions affecting air intake management.
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