Missouri Revised Statutes Title XXVI. Trade and Commerce § 407.571. Presumptions of nonconformity--exception

(1) The same nonconformity has been subject to repair four or more times by the manufacturer, or its agents, and such nonconformity continues to exist; or

(2) The new vehicle is out of service by reason of repair of the nonconformity by the manufacturer, through its authorized dealer or its agents, for a cumulative total of thirty or more working days, exclusive of down time for routine maintenance as prescribed by the manufacturer, since delivery of the new vehicle to the consumer. The thirty-day period may be extended by a period of time during which repair services are not available to the consumer because of conditions beyond the control of the manufacturer or its agents.