OBD II systems are being discussed. Technician A says the system can detect problems even before the driver is aware of a drivability problem. Technician B says when a problem is detected, the system will store a diagnostic trouble code in the vehicle's computer's memory. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. OBD II systems are designed to monitor the performance of some of an engine's major components, including those responsible for controlling emissions. Technician A is correct because the system can indeed detect problems before they become apparent to the driver, often through the use of various sensors that monitor the vehicle's performance. Technician B is correct because when the system detects a problem, it stores a diagnostic trouble code (DTC) in the vehicle's onboard computer system, which can then be retrieved using a specialized scanning tool to help diagnose and fix the issue.

OBD II Systems Are Being Discussed