Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0111: Intake Air Temperature (IAT) Circuit Range/Performance Problem
1998 Acura 3.5RL Special EditionSECTION DTC P0111: Intake Air Temperature (IAT) Circuit Range/Performance Problem
WARNING: This page is about a different car, the 1998 Acura 2.5TL. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
As intake air temperature increases, IAT sensor resistance decreases. IAT sensor is incorporated within the Mass Airflow (MAF) sensor.
- Turn ignition off. Disconnect MAF sensor 5-pin connector and remove MAF sensor. Reconnect sensor connector. Ensure sensor is exposed to ambient air temperature. Turn ignition on. Using a scan tool, check IAT sensor data. If ambient air temperature is indicated, go to next step. If ambient temperature is not indicated, replace MAF sensor.
- Using a hair dryer, warm IAT (MAF) sensor. Using scan tool, check IAT sensor data. If IAT sensor temperature increases 1.8°F (1.0°C) or more, problem is intermittent. System is okay at this time. If IAT sensor temperature does not increase as specified, replace MAF sensor.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.