The engine runs close to normal but it may run slightly erratically, have less power and idle inconsistently along with poor fuel economy. P0101 code will be generally preceded by the engine warning light coming on the dashboard display. This will make sure it is adjusted correctly for proper engine operation. MAF sensors must operate within specific ranges to be able to send correct signals to the ECU. which can cause interference in the output signal to the ECU.Ī vacuum leak can also cause a fault reading and can lead to other problems that may indicate several codes at the same time. This includes alternators, ignition wires, etc. The wiring or MAF sensor may be too close to higher voltage consuming components. This causes conflicts in the engine management system leading to poor performance and erratic operation. The MAF sensor is not operating within the performance range programmed into the ECU related to the data sampling rate. This provides input to the Engine Control Unit (ECU) giving outputs that are beyond the programming for the engine management. The most common source of the problem is the sensor range of the MAF sensor being outside of the normal operating range. P0101 is the general code for a problem with the Mass Airflow Sensor (MAS) operating range and/or an engine performance issue. The P0101 code can often be associated with a P0100, P0102, P0103 and P0104 codes.Mass Airflow (MAF) Circuit Operating Range or Performance Problem

Sl55 mass air flow sensor problems