Bexar County Emissions Testing 2026: Will Your Car Pass?

Texas ended the annual safety inspection for non-commercial vehicles on January 1, 2025, under House Bill 3297. You now pay a $7.50 inspection program replacement fee when you register instead (Texas DPS).

Emissions testing is a separate program, and it is expanding. After the EPA downgraded the San Antonio area's air quality status, Bexar County was added to the Texas counties that require emissions testing, starting November 1, 2026 (TCEQ).

• Which vehicles: gasoline cars and trucks 2 to 24 years old that are registered in Bexar County.
• Cost: $18.50, paid at a certified inspection station.
• When: once a year, before you renew your registration. From November 1, 2026, the registration can't be renewed until the vehicle passes.

Check the TCEQ vehicle emissions page for exemptions and the list of certified stations.

For the model years covered, the test is a computer check, not a tailpipe sniff. The station plugs into the OBD2 port under the dash and looks at three things:

• The check engine light. If the computer has the light turned on, the car fails.
• Readiness monitors. These are self-tests the car runs on its emissions systems while you drive. If too many haven't finished, the car is turned away until they do.
• Communication. The station has to be able to read the car's computer.

Disconnecting the battery or clearing codes resets the readiness monitors. It usually takes a few days of normal driving for them to finish, so clearing a code the morning of the test backfires.

• EVAP leaks (P0440 to P0457): anything from a loose gas cap to a failed purge valve or cracked hose.
• Oxygen sensors (P0135, P0141): a failed sensor heater sets the light even when the car drives fine.
• Catalytic converter efficiency (P0420, P0430): sometimes the converter, often an oxygen sensor or exhaust leak. Confirm before buying a converter.
• Misfires (P0300 to P0308): usually spark plugs or ignition coils.
• Recently cleared codes: readiness monitors that haven't finished yet.

Don't just clear the code. It resets the monitors and the light comes back. Find the cause, fix it, drive normally for a few days so the monitors finish, then retest.

We come to your driveway with a scanner that reads live sensor data, not just the code. Our check engine light diagnostic is $95 and is credited toward the repair.

We don't perform the official state emissions test. That has to be done at a TCEQ-certified inspection station.

A car that can't pass emissions becomes your problem at your first registration renewal. Before you buy, have a mechanic read the readiness monitors and check for emissions codes. Every pre-purchase inspection we do includes that check. For the rest of the pre-purchase homework, see our used car inspection checklist.