Which tests are typically conducted during a Smog Check?

The typically conducted tests during a Smog Check include a visual inspection, OBDII system check, tailpipe emissions test, and gas cap integrity test.

The visual inspection focuses on checking for any obvious issues related to emissions components, such as the catalytic converter and exhaust system. The OBDII system check assesses the vehicle's onboard diagnostic system for any stored trouble codes and monitors the performance of emissions-related systems. The tailpipe emissions test measures the actual pollutants emitted from the vehicle to ensure they are within legal limits. The gas cap integrity test is crucial because a faulty gas cap can allow fuel vapors to escape, contributing to emissions and failing the test.

This combination of checks ensures a comprehensive evaluation of the vehicle's emissions system, ensuring regulatory compliance and helping to reduce air pollution.