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Photo-optical sensors are widely used by many automotive manufacturers. Although it is no longer a popular system, many vehicles in circulation today use it and it is precisely these vehicles that currently have faults. Therefore, it is very important for the automotive diagnostic technician to be prepared to recognize the behavior of these sensors and analyze the oscillogram using the digital oscilloscope to decide if the sensor is related to the fault that the vehicle presents. This video is aimed at students and professionals in the automotive diagnostic service.