A Vehicle Is in the Shop Because It Failed an Emissions

A vehicle is in the shop because it failed an emissions test due to excessive carbon monoxide (CO) . The fault was a bad oxygen sensor that was easily replaced. Technician A says that the EGR system should be checked before the vehicle is retested. Technician B says the vehicle should be tested with a five-gas analyzer before it is retested. Who is correct?

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

Correct Answer:

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