What happens during a Texas emissions test

On Board Diagnostics-Second Generation (OBDII) is a computerized system on 1996 and newer model year vehicles that monitors emissions-related components and systems for proper functionality.

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

Model-year 1996 and newer vehicles are subject to OBD inspections.

OBD became the only type of emissions inspection performed across AirCheckTexas program areas

The light must come on when the ignition is turned to the ON position and the light must go OFF when the engine is started.

If the light is not working, the vehicle will FAIL the test

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

For vehicles year model 2001 and newer, we allow one (1) non-continuous monitor to be Not Ready and still pass the test, but two (2) or more Not Ready's will cause the vehicle to fail.

For vehicles year model 1996 – 2000, we allow two (2) non-continuous monitors to be Not Ready and still pass the test, but three (3) or more Not Ready's will cause the vehicle to fail.

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

All gasoline powered vehicles from 2 through 24 years old which are registered in emissions counties will receive the On-Board Diagnostic (OBDII) test.

The vehicle inspection report (VIR) is provided to the vehicle owner upon completion of the inspection and indicates whether the vehicle passed or failed the inspection.

The Emissions Tests Results section of the VIR shows the status of each readiness monitor.

Open safety recall information is provided on the back or second page of the VIR.

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.

The OBD system detects malfunction or deterioration in performance of components that would cause the vehicle not to meet emissions standards.

causing the vehicle's exhaust emissions to be 1 1/2 times the allowable emissions for the vehicle, as determined by the manufacturer.

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.