Skip the auto shop - Our mechanics make house calls

Q: How Is the OBD Used During a State-Required Inspection?

asked by on

How is the OBD used during a state-required inspection?

A: State inspections vary from state to state ...

State inspections vary from state to state and you should get any detailed inspection guidelines from the state you reside in. This article is for general guidelines of what the inspection of the vehicle onboard diagnostic (OBD) system is used for during the inspection.

If your state inspection test includes hooking up to your OBD connector, then the test is going to look to see if you have active codes in your computer and if all the emission monitors are passed in your system. If your vehicle has any codes in the system, it will fail you on the test. If you have no codes but have emission monitors that have not passed yet, then you will fail as well.

If you used your own scanner or had your vehicle scanned recently and the codes were cleared, then it will also clear the emission monitors. The emission monitors are a list of computer systems that pertain to the emissions of your vehicle. The computer systems are monitored and tested during a single or multiple drive cycles and either pass them or fail them, then put the Check Engine Light on with a code to the system. Some of the possible systems monitored are: engine misfires, catalyst, oxygen sensor, fuel system, EGR system, VVT system, EVAP system, secondary air injection, or other systems that the vehicle uses to control emissions. Diesel engines may have additional monitors that gasoline engines do not have. Just clearing a engine code and trying to get an inspection cannot be done since the monitor system will not pass if there is a problem in the system.

If you have a Check Engine Light on and cannot pass emission tests due to codes appearing or failing system monitors, then you should have a mechanic diagnose and repair the systems for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: P0420 code and engine is not starting.

Hi there. The p0420 code means that the catalytic converter is below threshold and is not functioning correctly. This code comes up when the catalytic converter can no longer burn off any fuel in the exhaust system. Take a raytech...

Q: Getting a Check engine light and codes

These codes are related to intake air ports not opening and closing at proper times. This can be related to carbon buildup inside the intake, a vacuum leak, or a faulty electric solenoid depending on the setup. I would start...

Q: Can I Look Up What Trouble Codes Mean?

When your Check Engine Light comes on or flashes on the dash for you it is indicating there is a problem in one of the vehicle systems and has set a trouble code stored in one of the modules’ memory....

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.