What does P0111 mean?
The intake air temperature (IAT) sensor tells the computer how warm the incoming air is. Cold air is denser and needs more fuel. On many cars the IAT is built into the MAF sensor.
The temperature reading does not make sense compared with other sensors or with how long the engine has been running.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Slight drop in fuel economy
- Hard starting in extreme temperatures (sometimes)
Common causes
- Sensor skewed out of calibration
- Real temperature problem (for example a stuck thermostat)
- Poor connection adding resistance
- Failed IAT sensor
- Unplugged or damaged connector
- Wiring fault
How to diagnose P0111
- After a cold soak overnight, compare this sensor with the other temperature sensors. They should all read within a few degrees.
- Check that the actual temperature matches with an infrared thermometer.
- Inspect the connector for corrosion.
- Compare IAT with coolant temperature after the car has sat overnight. They should be within a few degrees.
- Check sensor resistance against spec.
How to fix it
- Repair connector/wiring
- Replace the IAT sensor (or MAF assembly if it is integrated)
Estimated repair cost
Likely repairs for P0111 run from about $50 to $450, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Intake air temperature sensor | $50 - $200 |
| Mass airflow sensor replacement | $150 - $450 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P0111?
Low severity
Safe to drive in most cases.
P0111 FAQ
What does P0111 mean?
P0111 stands for "Intake Air Temperature Sensor 1 Circuit Range/Performance (Bank 1)". The intake air temperature (IAT) sensor tells the computer how warm the incoming air is.
Can I drive with a P0111 code?
Safe to drive in most cases.
How much does it cost to fix P0111?
It depends on the cause. The likely repairs for P0111 range from about $50 to $450 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P0111?
The most common causes are: sensor skewed out of calibration; real temperature problem (for example a stuck thermostat); poor connection adding resistance.