Code Definition

P0104 — Mass or Volume Air flow Circuit Intermittent

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0104

P0104 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0104 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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.

Because P0104 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0104 code indicates an intermittent signal in the circuit of the Mass Air Flow (MAF) sensor. This sensor is responsible for measuring the volume and density of air entering the engine. The Engine Control Module (ECM) relies on this data to adjust the fuel injection for optimal combustion. An intermittent signal from the MAF sensor can lead to inconsistent engine performance, affecting fuel efficiency, emissions, and potentially causing stalling or rough idling.

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