MAF (mass flow sensor) is more appropriate than VOLUMETRIC FLOW sensor for
DETERMINING the QUANTITY of INTAKE AIR in each cylinder.
Air/Fuel” (A/F) sensors rather than conventional oxygen (O2) sensors to monitor the exhaust gases coming out of the engine. What’s the difference? An air/fuel sensor can read a much wider and leaner range of fuel mixtures than a conventional O2 sensor.
https://en.wikipedia.org/wiki/Mass_flow_sensor