The invention relates to a heat exchanger for a motor vehicle, comprising a heat exchanger block and at least one collection box with a tube plate. The heat exchanger block is made of a plurality of adjacent tubes and corrugated rib elements arranged between the tubes, and one of the end regions of the tubes is received in the tube plate of the collection box in a fluid-tight manner. The tube plate of the collection box is made of plastic and is injection molded onto the heat exchanger block. A spacer element through which the tubes are guided is arranged between the tube plate of the collection box and the heat exchanger block, and the corrugated rib elements are spaced from the tube plate of the collection box by the spacer. The invention further relates to a method for producing a heat exchanger.