(a) Commencing with the 1990 model-year, the manufacturer of each light-duty and medium-duty motor vehicle and motor vehicle engine shall warrant to the ultimate purchaser and each subsequent purchaser that the motor vehicle or motor vehicle engine meets all of the following requirements:

1. (1) Is designed, built, and equipped so as to conform with the applicable emissions standards specified in this part.
2. (2) Is free from defects in materials and workmanship which cause the motor vehicle or motor vehicle engine to fail to conform with applicable requirements specified in this part for three years or 50,000 miles, whichever first occurs.
3. (3) Will, for a period of three years or 50,000 miles, whichever first occurs, pass a test established under Section 44012, but that the warranty shall not apply if the manufacturer demonstrates that the failure of the motor vehicle or motor vehicle engine to pass the test was directly caused by the abuse, neglect, or improper maintenance or repair of the vehicle or engine.
4. (4) Is free from defects in materials and workmanship in emission related parts which, at the time of certification by the state board, are estimated by the manufacturer to cost individually more than three hundred dollars ($300) to replace, for a period of seven years or 70,000 miles, whichever first occurs.