From the first source, "If the analyzer indicates that the motor vehicle does not meet the EPA‘s criteria for “readiness," that is, if the vehicle‘s OBD system does not indicate that the critical number of supported readiness monitors have been set, the motor vehicle is deemed “not ready” for an OBD inspection and has failed the OBD inspection;"

So... from the EPA (second source): "Although earlier requirements stipulated that OBD-equipped vehicles be rejected from further testing if any monitor was “not ready,” EPA has revised these readiness criteria to allow states to not reject MY 1996-2000 vehicles with two or fewer unset readiness codes, or MY 2001 and newer vehicles with no more than one unset readiness code. The complete MIL check and scan should still be run in all cases, however, and the vehicle should still be failed if one or more DTCs are set and the MIL is commanded on. The vehicle should also continue to be rejected if the OBD computer does not set readiness codes for 3 or more monitors on MY 1996-2000 vehicles, or two or more monitors on MY 2001 and newer vehicles. Readiness codes in general, and the specific codes and conditions covered by the April 5, 2001 amendments will be discussed in more detail under a separate section of this guidance."

So it depends on the age of your vehicle and on whether NJ provides the exemptions allowed. Sheesh. I hope you can make more sense of it than I can.

http://www.obd2works.com, as a professional auto diagnostic tools online supplier, providing our customers with a vast range of high-quality and affordable automobile maintenance tools.Our main business line covers: Automotive Professional Diagnostic Tools for OBD I and OBD II compliant vehicles; Auto Diagnostic tool, OBD2 Code Scanners, ECU Chip Tuning Tool, Car Key programmer Mileage Programmer as well as other more featured products.

You won't pass until all system are ready. It usually on takes a few days of driving for all systems to be ready.

If your check engine light is on....it is an automatic failure.

I just recently placed my battery and didn't know that when you do that it resets the evaporation system and other systems. I went to get inspection and failed for o2 sensor not ready, and evap system not ready. Now the o2 sensor is ready but the evap system is still not ready.

My friend is telling me they will pass me if I have only 1 not ready system? is that true? source?