The Chevrolet Vega:
http://en.wikipedia.org/wiki/Chevrolet_Vega

Failure to penetrate a gap between front fenders and cowl allowed moist debris and salt to rust the untreated steel, and trapped air prevented coating inside the tops of the front fenders, which on early Vegas had no protective liners.[8] The finance department had rejected liners as they would have added a $2.28 unit cost.
The Center for Auto Safety criticized the car. A letter from its founder Ralph Nader to GM Chairman Richard Gerstenberg contained a list of safety allegations, and said the car was a "sloppily crafted, unreliable and unsafe automobile" that "hardly set a good example in small car production for American industry".
http://en.wikipedia.org/wiki/Chevrolet_Vega
