Code Definition

P1112 — Intake Air Temperature Sensor intermittent

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Ford

About P1112

P1112 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1112 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1112 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The P1112 code indicates the PCM has detected an intermittent or unstable signal from the Intake Air Temperature (IAT) sensor. The IAT sensor is a thermistor that measures the temperature of air entering the engine, and on many Ford applications it is built into the mass air flow (MAF) sensor assembly. The PCM uses this reading to adjust fuel delivery and ignition timing for the incoming air density. When the signal drops out or jumps briefly, the PCM can miscalculate the mixture, which may cause occasional rough idle, hesitation, or a small loss of fuel efficiency, while leaving an intermitte...

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