Which mode is referred to for pending Diagnostic Trouble Codes?

Pending Diagnostic Trouble Codes (DTCs) are classified under Mode 7 of the On-Board Diagnostics II (OBD-II) system. These codes indicate that a fault has been detected, but the condition has not yet been confirmed as a failure through multiple drive cycles. This allows technicians to monitor intermittent problems that might not consistently trigger a check engine light but still need attention.

Understanding the function of Mode 7 is vital for smog repair technicians, as it provides insights into possible emissions-related issues that could affect a vehicle's performance and emissions levels. Recognizing these pending codes allows for proactive diagnostics and repairs before they escalate into more significant problems that could impact compliance with emission standards.

The other modes mentioned refer to different aspects of the OBD-II system: Mode 6 pertains to on-board monitoring results, Mode 8 relates to requests for vehicle-related information, and Mode 9 involves data related to vehicle identification and calibration. Each mode serves a unique purpose, but for pending DTCs specifically, Mode 7 is the correct reference point.