Highlander Hybrid System Readiness Error

I understand your frustration. It's not uncommon to see OBD readiness issues after using a diagnostic tool. Usually, the diagnostic tool resets some of the monitors. Have you tried performing a "drive cycle"? This involves a specific series of driving maneuvers intended to reset the monitors. How long ago was the OBD2 read performed?

Thanks! I hadn’t thought of a drive cycle. Do you have more information on what a drive cycle entails for a Toyota Highlander Hybrid? Also, the OBD2 read was about a week before this started. Is it possible some errors might clear on their own?

Yes, some monitors will eventually reset on their own given enough drive time under the right conditions, but a week should have been sufficient for at least some to clear. Unfortunately, the exact drive cycle varies depending on the vehicle and the specific monitor. A generic drive cycle involves cold starting the car, idling, highway speeds, and city driving. For your Highlander Hybrid, it would be best to check the repair manual. However, considering that you explicitly want to pass inspection, it might be time to go to a workshop for a proper vehicle inspection. Please keep us posted!

I appreciate your advice. I finally resolved this. I just needed to do a computer reset, after which it immediately passed the emission test! And the best part? The repair cost was 0€! Thanks again!