What does the term "readiness monitors" refer to in an OBD test?

The term "readiness monitors" in the context of an OBD (On-Board Diagnostics) test pertains to indicators that show whether specific emissions-related systems in a vehicle have completed their tests and are functioning properly. These monitors are crucial for emissions compliance, as they help to determine whether a vehicle is prepared for inspection by confirming whether the necessary systems have been activated and have successfully performed their diagnostic checks. When the vehicle's readiness monitors indicate that certain systems are "ready," it signifies that the OBD system has completed its self-checks and that the vehicle is likely to meet emissions standards during testing. This ensures that the emissions control systems are operational before the actual emissions test is conducted, which is essential for both compliance and vehicle health.