Code Definition

P1112 — Intake Air Temperature Sensor Circuit Intermittent

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

About P1112

P1112 is a manufacturer-specific powertrain diagnostic trouble code recorded for Mazda 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

On Mazda vehicles, DTC P1112 indicates the Engine Control Module (ECM) has detected an intermittent or unstable signal in the Intake Air Temperature (IAT) sensor circuit. The IAT sensor is a negative temperature coefficient thermistor whose resistance falls as intake air temperature rises, and the ECM uses this reading to fine tune fuel delivery and ignition timing. Unlike a hard open or short, an intermittent fault appears only briefly, often as the sensor reading momentarily jumps to an implausible value before recovering. When this code sets the driver may notice occasional rough idle, hesi...

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