Engine Intake Air Temperature Sensor Out of Range
The engine's intake air temperature sensor is reporting values outside the expected range.
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What it means (plain English)
The sensor that measures how hot the air going into the engine is is reading a temperature that doesn't make sense, which can affect how the engine runs.
What the computer is actually seeing
The ECM receives signals from the intake air temperature sensor that should range from -40°C to 125°C. If it sees a value lower than -40°C or higher than 125°C for more than 10 seconds, it triggers this fault code.
What a healthy reading looks like
Intake air temperature should typically range from -40°C to 125°C. A reading of 15°C to 35°C is common when the engine is at operating 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 connections to the intake air temperature sensor for damage or corrosion.
- 22. Check the intake air temperature sensor for correct resistance values based on temperature (should show a specific resistance value at a specific temperature) using a multimeter.
- 33. If the sensor tests fine, use a scan tool to monitor its live data while the engine is running. Verify readings during normal operation.
- 44. If the intake air temperature readings are still out of range, replace the sensor and clear the codes. Test drive to confirm the issue is resolved.
Common causes
- Faulty intake air temperature sensor
- Wiring issues (shorts, opens) between the sensor and the ECM
- Poor connections or corroded terminals
- Intake air leaks
- Extreme environmental conditions affecting sensor performance
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so it's better to address it soon. Driving with this issue may cause decreased performance and fuel efficiency.
Will this code come back after I clear it?
If the underlying issue is not fixed, the code will likely return after the engine runs for a short time.
Why does this code appear with SPN 1270?
SPN 1270 relates to a similar sensor problem, often indicating issues with ambient or intake air monitoring.
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