Catalytic Converter Monitors Are Being Discussed

question 21

Multiple Choice

Catalytic converter monitors are being discussed. Technician A says that if the converter is working, the downstream signal frequency should mirror the upstream sensor. Technician B says that the downstream sensor should provide a low-frequency voltage signal. Who is correct?

• A)A only
• B)B only
• C)both A and B
• D)neither A nor B

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