Code Definition

P1103 — Mass Airflow Sensor Signal Inconsistent with Engine Speed

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

About P1103

P1103 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 P1103 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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.

P1103 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, P1103 indicates that the Engine Control Module (ECM) has detected the Mass Air Flow (MAF) sensor signal as inconsistent with the current engine speed. The MAF sensor measures the volume or mass of air entering the engine, and the ECM cross checks this reading against engine RPM and load to confirm the airflow value is plausible. P1103 sets when the airflow the MAF reports does not agree with what the engine speed and other inputs indicate it should be, suggesting a contaminated or failing sensor, an air leak, or a circuit fault. With this code active the driver may notice ro...

Join TaT to view the complete code information and diagnostic details.

Quick Facts