P0111: Intake Air Temperature Sensor Range/Performance Problem
Can you still drive? Yes, this is a low-severity code. Your vehicle will run with slightly reduced efficiency but is safe to drive.
What Does P0111 Mean?
Code P0111 is set when the intake air temperature (IAT) sensor reading does not change as expected during engine warm-up or driving. The ECU expects the IAT reading to correlate with engine coolant temperature and ambient conditions, and flags this code when the relationship is irrational. This may cause slightly incorrect fuel mixture calculations.
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An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Faulty IAT sensor
- IAT sensor stuck in one position
- Restricted airflow around IAT sensor
- Intake air duct obstruction
Symptoms
- Check engine light on
- Slightly rough idle when cold
- Minor decrease in fuel efficiency
- Hard starting in cold weather
Diagnostic Steps
- 1Read and document freeze frame data
- 2Compare IAT sensor reading to ambient temperature with a cold engine
- 3Monitor IAT readings during warm-up to see if they change appropriately
- 4Inspect the IAT sensor and connector for contamination
- 5Replace the IAT sensor if readings do not respond to temperature changes
Recommended Parts & Tools
intake air temperature sensor
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $20 - $150 |
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Frequently Asked Questions
What does the IAT sensor do?
The intake air temperature sensor measures the temperature of air entering the engine. The ECU uses this data to adjust fuel injection timing and amount for optimal combustion.
Is P0111 serious?
P0111 is low severity. You may notice slightly worse fuel economy or cold-start issues, but it is not dangerous to drive with this code.
Community Fix Reports
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