If your check engine light is on, there is a good chance your vehicle is not ready for a successful SMOG inspection. That light often points to a problem that affects emissions compliance or system readiness.
Why clearing codes is not enough
Some drivers try to reset the light right before the test. That usually does not solve the real issue and can create readiness monitor problems that still prevent a smooth inspection.
What readiness monitors have to do with it
Many newer vehicles rely on readiness monitors as part of the inspection process. If the battery was disconnected or codes were recently cleared, the vehicle may not be ready even if the light is off.
Best next step
Investigate the cause before paying for a test. In many cases, diagnosing the real problem first saves time, money, and repeat visits.