Here are a few key factors to consider:
Smog Check: In areas where smog checks or emissions inspections are required, clearing trouble codes related to emissions systems may not be enough to pass the inspection. If the underlying issue causing the trouble code is not fixed, the vehicle may still fail the emissions test.
Readiness Monitors: Modern vehicles have a series of readiness monitors that assess the functionality of various emission control systems. When a trouble code is cleared, some readiness monitors may not immediately reset, and the vehicle may need to be driven through a specific drive cycle for the monitors to complete. If not all monitors are ready, the vehicle may fail the inspection.
Pending Codes: Some OBD II scanners may not be able to detect or erase pending trouble codes. These codes are stored in the vehicle's computer but have not yet met the criteria to set the Check Engine Light (CEL) on. If the inspection process involves a thorough scan for pending codes, clearing trouble codes may not be sufficient to pass the inspection.
Overall, while clearing trouble codes can help address certain issues, it's crucial to understand the specific requirements and regulations for vehicle inspections in your jurisdiction. If the underlying problems that caused the trouble codes are not resolved, the vehicle may not pass inspection even after the codes are cleared. It is always advisable to address any trouble codes and ensure the vehicle meets the necessary emission standards to ensure a successful inspection.
