How a California smog check works

Every smog inspection follows the same BAR-mandated protocol. Here's what happens from arrival to DMV cert filing.

Step 1 — Arrive (no appointment needed)

Walk in any time during business hours. Bring the vehicle. We pull your DMV record electronically from your plate.

Step 2 — Connect to OBD-II equipment (5 min)

For 1996+ vehicles, our BAR-calibrated equipment connects to your vehicle's on-board diagnostic port. We read readiness monitors + check for stored fault codes.

Step 3 — Tailpipe + visual inspection (5-10 min)

For 1976-1995 vehicles, we measure tailpipe emissions directly. For all vehicles, we visually verify the catalytic converter, EGR system, EVAP system, and other emissions components.

Step 4 — Result + recommendation (1 min)

Pass: we electronically file your smog certificate with the DMV within hours. You can renew your registration online same-day.

Fail: we explain what failed. At test+repair shops, we can diagnose and fix on-site. Test-only shops recommend a sister repair shop in the network.

Step 5 — Retest (free within 30 days at STAR stations)

If you needed repair, your retest is free at any STAR-certified station in our network within 30 days. Bring proof of original test + repair receipt.

Average timing

• Standard pass: 15-25 minutes total
• With diagnostics: 30-45 minutes
• With on-site repair: same-day for most issues

What you bring

• Your vehicle. That's it. Everything else we pull electronically.