On-board diagnostic (OBD) systems I and II are being discussed. Technician A says that OBD II systems require misfire detection. Technician B says that OBD I was capable of detecting exhaust emission control system failures. Who is right?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

OBD II systems, introduced in the mid-1990s, are required to detect engine misfires as part of their comprehensive monitoring capabilities to ensure vehicles meet emissions standards. OBD I systems, which were the predecessors to OBD II, had more limited diagnostic capabilities and were not standardized across manufacturers. While OBD I systems could detect some issues that might affect emissions, they were not as advanced or consistent in their ability to diagnose exhaust emission control system failures specifically.

On-Board Diagnostic (OBD) Systems I and II Are Being Discussed