Intake Air Temperature Sensor 1
The ECM has detected 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 sensor measures how hot the air is coming into the engine. If it's faulty, the engine control unit (ECU) can’t adjust fuel and air mix properly, which can hurt performance and emissions.
What the computer is actually seeing
The ECM expects a voltage from the intake air temperature sensor that correlates to the temperature of the incoming air. It should range from 0.5V (approx. -40°C/-40°F) to 4.5V (approx. 125°C/257°F).
What a healthy reading looks like
Normal intake air temperature should be between -40°C and 125°C. Voltage expected to be between 0.5V and 4.5V depending on temperature.
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 wiring and connector for damage or corrosion at the intake air temperature sensor.
- 22. Measure the voltage at the sensor's connector with the engine running. It should be between 0.5V and 4.5V based on air temperature.
- 33. If the voltage is out of range, replace the intake air temperature sensor and retest.
- 44. If voltage is correct, inspect the ECM for faults or reprogram if necessary.
Common causes
- Faulty intake air temperature sensor
- Wiring issues or short circuits
- Connector problems or corrosion
- Extreme temperature conditions affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this fault code?
Yes, but performance may be impacted, and emissions could cause problems at smog checks.
Will this problem come back after repair?
If the new sensor and wiring are properly installed, it shouldn't come back.
Why does this code sometimes appear with other codes?
Sensor faults often accompany related issues with air intake or fuel management systems.
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