Skip the auto shop - Our mechanics make house calls

Q: Failed smog test. OBD-II monitors not ready. Needs to be reset

asked by on

Failed smog test. OBD-II monitors not ready. Need to be reset. How much will this cost?

My car has 165000 miles.
My car has an automatic transmission.

Hello. If your monitors are showing not ready, then that is because the computer was recently reset or the battery may have been replaced. If either of these occurred, then there is a specific amount of driving that needs to be done in order to get these to reset. The driving that needs to be done has to include things such as highway driving, stop-and-go driving, accelerating, braking, and many on and off key cycles. This can take anywhere from 100 up to 500 miles of driving as long as it is varied as I mentioned. If you would like to get an estimate for this, you can enter your vehicle information on our estimator page to get a quote.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My Check Engine Light is on after the fuel tank overflowed

When the fuel overflowed, the fuel system most likely caused the vapor recovery and tank vent to become flooded with liquid fuel. This flooding of the vent system may cause the computer to sense a problem in the fuel tank...

Q: Brake line broke

In theory, you could run the brake line up and over rather than under and around the motor, however depending on the tightness of the line you may run into pressurizing problems with the fluid. You will need to be...

Q: 2009 chrysler 300c timing chain recall, does this reset the computer? (I need smog test soon after)

Yes this would reset the computer monitors for your smog test to pass. You should drive the vehicle for at least a week or more driving in all types of situations. Have a mechanic scan the computer to see if...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.