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How to Pass a Smog Test Even if EVAP Monitor Isn’t Ready

A lot of vehicle owners out there are having second thoughts on passing the smog test when EVAP Monitor isn’t ready. People wonder if the EVAP system monitor really needs to be complete in order to pass for a smog check, at least here in California. Each state may have a different requirement so please contact your local emission agency for your state. Normally California tends to be the front-runner in air quality standards. The good news for readers of RandomFix article is that a vehicle with an incomplete EVAP Monitor can definitely pass the smog inspection. The number of allowable incomplete OBD II readiness monitors have been reduced by the Bureau of Automotive Repairs. This includes both the 1999 and older vehicles or BAR-97 smog inspection system and the 2000 and newer vehicles or BAR-OIS smog inspection system. The EVAP monitor is still allowed to be unready and will not cause for your smog test to fail.

However, the new criteria for the new EMR or Emission Monitor Requirement need to be followed:

All emission monitors should be ready and complete for vehicle models 2000 and newer powered by gasoline. Again, an incomplete EVAP monitor won’t cause the smog test to fail. This is the only monitor that’s allowed to be incomplete on models 2000 and newer vehicles powered by gasoline.


What to do?

California requires DMV with smog testing renewal every 2 years. You have to pass the smog inspection to get your new registration tags. Having trouble in getting your EVAP ready could be a problem, is it? However, the good news is already out. If you get all your monitors ready except for the EVAP, you’re good to go for a smog test. Note: EVAP monitor is normally the last monitor to get ready.

Scan tool

You’ll need a scan tool, there is a lot of scan tool available but the one I’m using is very helpful and cost only around $20. It helped me in unplugging the battery in my previous videos, even played a good role in my success to do a reset for the check engine light. However, on newer vehicle disconnecting the battery sometimes no longer clears the check engine light. Make the simple scan tool for valuable than ever. Now, we need to make sure that all other monitors are complete and ready to be inspected at local emission or smog station.


RandomFix will show you tricks to get around if your EVAP is not ready. To test the EVAP Monitor (Evaporative Emission Control), we’ll have to use the scan tool to check it’s status. The EVAP system is designed to keep that gasoline vapor from going out into the atmosphere.

Say, you have a gross or small leak, these leaks are very common to some vehicles and the only way to confirm the presence of an EVAP leak is to perform a smoke test. In a smoke test, your gas tank will be filled with smoke. Smoke is a visual confirmation of the leak and allows for easy detection. A good quality smoke machine is essential in identifying the source of the leak.

Another reason why your EVAP monitor may not be ready, other than the possible internal component malfunction, is having either less than ¼ tank or more than a ¾ tank. You’ll want to stay in between to allow the EVAP monitor to complete its test.

Another issue for not getting the EVAP ready, other than a faulty internal system which will need a professional grade scan tool and a qualified automotive technician to diagnose the issue. Another possible reason for an EVAP leak especially when the vehicle is more than 10 years old is the fuel filler cap. The rubber in the gas caps starts to rip apart or can dry out causing a small leak. This small leak can cause can cause your check engine light to come on. A simple faulty gas cap could force you to take your vehicle in an auto shop who’ll charge you with big bucks just for checking it. To keep this from happening, make sure to automatically replace your gas cap every 10 years and save yourself some headache.

Are you ready to take the smog test today?

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