The Uniform Commercial Code or UCC has been enacted in all 50 states and some  of the territories of the United States. It is the primary source of law in all  contracts dealing with the sale of products. The TARR refers to Tender,  Acceptance, Rejection, Revocation and applies to different aspects of the  consumer's "relationship" with the purchased goods. 
 TENDER - 
The tender provisions of the Uniform Commercial Code  contained in Section2-601 provide that the buyer is entitled to reject any goods  that fail in any respect to conform to the contract. Unfortunately, new cars are  often technically complex and their innermost workings are beyond the  understanding of the average new car buyer. The buyer, therefore, does not know  whether the goods are then conforming.
 ACCEPTANCE - 
The new car buyer accepts the goods believing and  expecting that the manufacturer will repair any problem he has with the goods  under the warranty.
 REJECTION - 
The new car buyer may discover a problem with the  vehicle within the first few miles of his purchase. This would allow the new car  buyer to reject the goods. If the new car buyer discovers a defect in the car  within a reasonable time to inspect the vehicle, he may reject the vehicle. This  period is not defined. On the one hand, the buyer must be given a reasonable  time to inspect and that reasonable time to inspect will be held as an  acceptance of the vehicle. The Courts will decide this reasonable time to  inspect based on the knowledge and experience of the buyer, the difficulty in  discovering the defect, and the opportunity to discover the defect.
The  following is an example of a case of rejection: Mr. Zabriskie purchase a new  1966 Chevrolet Biscayne. After picking up the car on Friday evening, while en  route to his home 2.5 miles away, and within 7/10ths of a mile from the  dealership, the car stalled and stalled again within 15 feet. Thereafter, the  car would only drive in low gear. The buyer rejected the vehicle and stopped  payment on his check. The dealer contended that the buyer could not reject the  car because he had driven it around the block and that was his reasonable  opportunity to inspect. The New Jersey Court said;
  To the layman, the complicated mechanisms of today's automobile are a  complete mystery. To have the automobile inspected by someone with sufficient  expertise to disassemble the vehicle in order the discover latent defects before  the contract is signed, is assuredly impossible and highly impractical.  Consequently, the first few miles of driving become even more significant to the  excited new car buyer. This is the buyer's first reasonable opportunity to enjoy  his new vehicle to see if it conforms to what it was represented to be and  whether he is getting what he bargained for. How long the buyer may drive the  new car under the guise of inspection of new goods is not an issue in the  present case because 7/10th of a mile is clearly within the ambit of a  reasonable opportunity to inspect. Zabriskie Chevrolet, Inc. v. Smith, 240 A. 2d  195(1968) 
 It is suggested that Courts will tend to excuse use by consumers if possible.  
 REVOCATION - 
What happens when the consumer has used the new car  for a lengthy period of time? This is the typical lemon car case. The UCC  provides that a buyer may revoke his acceptance of goods whose non-conformity  substantially impairs the value of the goods to him when he has accepted the  goods without discovery of a non-conformity because it was difficult to discover  or if he was assured that non-conformities would be repaired. Of course, the  average new car buyer does not learn of the nonconformity until hundreds of  thousands of miles later. And because quality is job one, and manufacturers are  competing on the basis of their warranties, the consumer always is assured that  any noncomformities he does discover will be remedied.
What is a  noncomformity substantially impairing the value of the vehicle? 
 - A noncomformity may include a number of relatively minor defects whose  cumulative total adds up to a substantial impairment. This is the "Shake Faith"  Doctrine first stated in the Zabrisikie case. "For a majority of people the  purchase of a new car is a major investment, rationalized by the peace of mind  that flows from its dependability and safety. Once their faith is shaken, the  vehicle loses not only its real value in their eyes, but becomes an instrument  whose integrity is substantially impaired and whose operation is fraught with  apprehension".  
 - A substantial noncomformity may include a failure or refusal to repair the  goods under the warranty. In Durfee V. Rod Baxter Imports, the Minnesota Court  held that the Saab owner that was plagued by a series of of annoying minor  defects and stalling, which were never repaired after a number of attempts,  could revoke, "if repairs are not successfully undertaken within a reasonable  time", the consumer may elect to revoke.  
 - Substantial Non Conformity and Lemon Laws often define what may be  considered a substantial impairment. These definitions have been successfully  used to flesh out the substantial impairment in the UCC. 
 
 Additional narrative information on Magnusson-Moss, UCC and lemon laws on  these pages is provided by T. Michael Flinn, attorney.