P01XX Codes – Air and Temperature Sensor Circuit Malfunctions

The P01XX code group deals with Mass Air Flow (MAF) sensors, Manifold Absolute Pressure (MAP) sensors, Intake Air Temperature (IAT) sensors, and Throttle/Pedal Position sensors. These components are vital for determining the correct air-fuel mixture by measuring the volume and temperature of incoming air. Faults here typically include issues such as “Circuit Low,” “High,” “Range/Performance,” or “Intermittent” signals from these sensors. This category also includes coolant temperature sensors and oxygen sensor (O2) diagnostics, both of which influence how the engine control module (ECM) manages fuel injection and ignition timing. Codes starting with “P01” are key to diagnosing sensor accuracy, signal stability, and circuit integrity, all of which are fundamental to efficient fuel metering.