FAQ, California Smog Check, About Smog Check, SmogCheck.com
Why did California choose “smog check”?
The word “check” implies a broader inspection, not just a test of emissions but also:
Visual inspection of components
Functional tests (e.g., gas cap, EGR valve)
OBD diagnostics
It helps reinforce that the process includes checking for tampering, monitoring readiness, and verifying compliance, not just measuring tailpipe output.
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