Engine Intake Air Temperature Sensor 1
Indicates a fault with the intake air temperature sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine's computer measures how hot the air going into the engine is through the intake air temperature sensor. If this sensor fails, the computer can get wrong info, leading to poor fuel mixing and engine performance.
What the computer is actually seeing
The computer looks for a voltage signal from the intake air temperature sensor, which should typically be between 0.5V (around -40°C) and 4.5V (around 150°C). If the signal is outside of this range, it triggers the code.
What a healthy reading looks like
Voltage should be between 0.5V and 4.5V, corresponding to temperatures from -40°C to 150°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.
- 1Inspect the intake air temperature sensor wiring for any visible damage or wear.
- 2Check the connector for corrosion or loose connections and ensure it's seated properly.
- 3Using a multimeter, measure the voltage at the intake air temperature sensor with the engine running: expect between 0.5V and 4.5V.
- 4If voltage is out of range, replace the sensor if wiring/connectors are good; if voltage is correct, check for ECM issues or sensor calibration.
Common causes
- Wiring issues (damaged, shorted, or corroded wires)
- Connector problems (loose or corroded terminals)
- Faulty intake air temperature sensor
- Contamination or debris affecting sensor operation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's of moderate severity. You might experience reduced performance, so fix it soon but it’s drivable for now.
Will this problem come back after clearing the code?
If the underlying issue (like a bad sensor or wiring problem) isn’t fixed, it can return.
Why does this code show up with other codes?
Intake air temperature affects engine performance; other codes might relate to poor air/fuel mixture issues.
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