Technician A says retrieving DTCs from the control system is the best beginning for diagnosing emission problems. Technician B says because a single emissions system component failure can set multiple DTCs, codes should be used only to confirm the effectiveness of the repairs. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

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The Answer of Technician A says retrieving DTCs from the control system is the best beginning for diagnosing emission problems. Technician B says because a single emissions system component failure can set multiple DTCs, codes should be used only to confirm the effectiveness of the repairs. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Technician a Says Retrieving DTCs from the Control System Is