Engine Light is on, could it be due to malfunction of O2 Cat Convertor Sensor

Question

My mechanic says its either malfunction of front O2 sensor or rear O2 sensor (Cat Convertor temp sensor).

Answer 1

Yes it can be a problem with the 02 sensors, If the front 02 sensor is correctly cycling from lean to rich , you can have failing rear 02 sensor , that can set a false catalytic convertor code condition.