Chapter 24, Problem 3ASRQ

While discussing the catalyst efficiency monitor: Technician A says that if the catalytic converter is not reducing emissions properly, the voltage frequency increases on the downstream HO₂S. Technician B says that if a fault occurs in the catalyst monitor system on three drive cycles, the MIL will be illuminated. Who is correct?

1. Technician A

Technician B

Both A and B

Neither A nor B