* Please Read This First *

NOTE: This article applies to OBD-II equipped vehicles only.

NOTE: Some manufacturers do not provide a specific drive cycle test procedure. Some manufacturers include drive cycle procedures as part of self-diagnostics. Always check appropriate Self-Diagnostics or Testing W/Codes article for information related to drive cycle testing procedures. Some manufacturers may incorporate readiness testing as a part of the DTC test.

NOTE: A number of vehicles have had recalls related to "Readiness Monitor" issues, or may have testability issues. Some vehicles may not be testable for emission controls. See APPENDIX J for details on these vehicles.