Your Vehicle Did Not Pass Smog... Test Says "Not Ready" - Don't Panic!

remicaubert
May 29
5 min read

It's time for your biennal smog. You think you are doing a good job at maintaining your car, and the visual checks pass ... But the overall test result is "Not Ready" ?!

It sounds like a big problem, but it's not. We are here to help and explain what "Not Ready" means and what to do next.

What Does "Not Ready" Mean on Your Smog Test?

Your vehicle’s onboard computer runs self-tests on various emissions systems, and checks that each relevant monitor (like oxygen sensor, evaporation system, ...) is complete. Ie it has then enough data to give an accurate measurement. When your car shows "Not Ready," it means the vehicle’s computer system can't finish running all the tests it needs to pass the smog test, not enough data ! Showing "Not Ready" is different from failing the smog test, because your vehicle may pass once the monitors are complete.

Why Does This Happen?

There are a few reasons your car might say "Not Ready":

You or your repair shop recently cleared the car’s computer codes, or the battery was disconnected, or died. This resets the computer monitors to zero.
The vehicle has been sitting in a garage
The car hasn’t been driven enough, or in the right way, to complete the tests. Typically it happens when you mostly drive short distances, like city drive.
There might be a problem with the emissions system that stops the monitors from finishing.

The first three reasons are the most common. You would be surprised how often it happens. No need to worry.

How to Get Your Vehicle Ready for the Smog Test

If your test says "Not Ready," don’t rush to your repair shop or dealership right away, nor to the smog station for a retest, First, you need to drive your car in a way that enables the computer to complete its data and tests. This is called a "drive cycle."

What Is a Drive Cycle?

A drive cycle is a set of driving conditions that help your car’s computer check all the emissions systems. It usually means driving at different speeds, idling, driving a long one time strech, and sometimes stopping and starting.

Here’s a simple example of a drive cycle we recommend:

Start your car and let it idle for about 2 minutes.
Drive at a steady speed of 40 to 60 mph for 10 to 15 minutes. For vehicles used to driving short distances, we typically recommend to drive 60 miles at 60 mph on freeway.
Include some stops and starts during your drive.
But avoid turning off the engine during this time.

This helps the car’s computer complete all the tests it needs. After this, the "Not Ready" message should clear, meaning all neeeded monitors are complete. Ask your favourite technician to hand scan your vehicle computer to check this, before they run the test again, in case you still need to drive it more...

Please note that all vehicles are created equal ! Some models need more miles to complete all monitors. Please trust your technician when they ask you to drive it more, it's for your own good. It's cheaper than to have it done by the dealership, most times a repair is not necessary !

When to Get Help

If you’ve completed the drive cycle and brought the vehicle to us several times, and your car still says "Not Ready," it might mean there is a real problem. Some parts of the emissions system might not be working right. Your smog technician will recommend to check with your usual repair shop.

Smog Check Service at Smog Express

Whether you live in San Pablo, HerculesYou need a smog check station you can trust. Smog Express in Richmond has been serving the East Bay for over 30 years. A high satisfaction rate of 4.8 stars, over 700 google reviews, is there to prove it. Smog Express Richmond is here to help and make the process easy. Our ace techs know how to handle "Not Ready" vehicles. We are Star Certified by the Bureau of Automotive Repair. We also offer one free retest with your first quote. This enables you to drive the vehicle, get it ready, and pay for the service only once. We are a smog test-only facility, we are not involved into a pricey repair.

Trust us to help you solve this "Not Ready" issue.

You can learn more about our smart tips here: https://www.smogxpress.com/smart-tips

Emissions System Repair

If your car has a real emissions problem, you might need repairs. Common fixes include replacing oxygen sensors, a faulty valve, sometimes the catalytic converter, or fixing leaks in the exhaust system.

Vehicle Health Monitoring Tools

There are also tools you can use at home to check your car’s emissions system. For example, an OBD-II scanner can read your car’s computer codes. This helps you see if there are any issues before going to the smog check.

You can find many affordable OBD-II scanners online or at auto parts stores.

Tips to Avoid "Not Ready" in the Future

To keep your car ready for smog tests, follow these tips:

Avoid disconnecting your car battery unless necessary, or letting it die.
Drive your car regularly and include highway driving.
Fix any check engine light issues quickly.
Use quality fuel and keep up with regular maintenance.

These simple steps help your car’s computer run its tests and keep emissions low.

Dashboard showing the check engine light still on although the engine is running, a sign to check emissions system.

What to Do If You Fail the Smog Test

If your car fails the smog test, don’t panic. First, ask for a detailed report. It will tell you which part of the emissions system caused the failure.

Next, get a trusted mechanic to inspect your car. Fixing the problem usually means replacing or repairing parts like sensors or else

After repairs, you can return for a retest. A station like Smog Express, offers a free retest or can guide you through the process.

Why Choose a Star Certified Smog Check Station?

Star Certified stations meet strict standards set by the state. They have the right tools and training to handle all smog check issues, including "Not Ready" vehicles.

Choosing a Star Certified station means you get accurate results and expert advice. Smog Express is proud to be a trusted Star Certified smog check station in Richmond and the East Bay.

They make the process simple and stress-free.

Final Thoughts

Seeing "Not Ready" on your smog test can feel like a setback. But it’s not the end. Most of the time, it means your car’s computer just needs more time or the right drive cycle to finish its tests.

If you follow the right steps, you can get your vehicle ready. Use drive cycles, check for issues, and get help from trusted places like Smog Express.

Remember, keeping your car well-maintained helps avoid "Not Ready" and makes smog checks easier. Take care of your vehicle, and the smog test will be just another quick stop.

Ready to get your smog check done right? Visit Smog Express for a fast, friendly, and reliable service in Richmond and the East Bay. Your car will thank you.