How to prepare for a Texas emissions test

If the MIL command status is ON with a DTC set, the vehicle will fail.

If you've cleared the DTCs (using a scan tool or disconnecting the battery), monitors will reset to "Not Ready".

In order to get the monitors set back to Ready, the vehicle must be driven through a drive cycle, which is a combination of city/highway driving for a set period of time.

Insurance Catalytic Converter System EGR System (Exhaust Gas Recirculation) Evaporative Emissions Control System Exhaust System Gas Cap Intake System PCV System (Positive Crankcase Ventilation)

The department encourages drivers in Bexar Co. to begin preparing for emissions testing requirements now by taking their vehicles in for service.

Catalytic Converter failure, Faulty gas cap, Fuel metering out of specification, Incorrect ignition timing, Inoperative injection system and/or thermostatic air cleaner, Mis-routed vacuum lines, and Faulty Positive Crankcase Ventilation (PCV) System or Exhaust Gas Recirculation (EGR) System.

Disconnecting the battery is the most common reason why monitors are "Not Ready"

Tune-ups and other engine repairs Dead battery replacement Car radio installations Car alarm installations

OBDII testing uses a scan tool that plugs into the vehicle's computer and determines that the emission system and components are working properly.

If you choose not to take it back to the station that originally performed the inspection or should you present the vehicle after the 15 days , then your vehicle is no longer eligible for the free re-test.

Vehicle registration renewals can be completed up to 90 days in advance of expiration; a passing emissions test can be obtained within that period.

You do not have to pay to get your vehicle re-inspected if it fails inspection. If your vehicle fails the inspection, have the item(s) repaired and take it back to the inspection station that originally performed the inspection within 15 days for a free re-test.