An OBD II PCM will erase confirmed DTCs from memory if it does not see the problem occur again for:
A) 40 minutes of engine operation
B) 40 restarts of the engine
C) 40 warm-up and cool-down cycles of the engine
D) 40 miles of vehicle travel

Question

Quizplus · Accepted Answer

OBD II systems are designed to erase confirmed Diagnostic Trouble Codes (DTCs) if the issue does not reoccur over 40 warm-up and cool-down cycles, indicating the problem is no longer present.

An OBD II PCM Will Erase Confirmed DTCs from Memory