Caveat Emptor — let the buyer beware — was a reasonable attitude when the buyer could easily judge the quality of the merchandise he was buying.
However, as automobiles have become increasingly sophisticated, with electronic engine control systems and other hi-tech hardware, there are fewer manifestly clear ways by which to judge the quality of replacement parts.
Reputable manufacturers of replacement parts have built their reputations of repeat business. Their products meet or exceed the Original Equipment (OE) specifications. If they don't perform, you're not going to come back and buy many more of the same. Counterfeiting, as applied to auto parts, is a broad term that covers any form of deception designed to trick the buyer into believing that he or she is purchasing a part produced by the original equipment manufacturer or a reputable aftermarket manufacturer.
Counterfeit products should not be confused with "generic or no-brand" products such as those found in the food industry. It's fully understood that these types of products are not branded products. The key to counterfeit parts lies in the fact that no attempt is made to identify the source of manufacture and that the counterfeit part and packaging closely resembles the real thing.
Packaging of reputable parts manufacturers is often unique and highly recognizable, but those who buy replacement parts by appearance or packaging alone should beware. Counterfeit parts are made to look like the real thing both in packaging and in appearance.
Counterfeit packaging usually involves the unauthorized use of a registered trademark on the packaging or the simulation of a part using original equipment characteristics and is designed to pass off generally sub-standard parts as the genuine article. Counterfeit parts have the right number of wires and connectors. They look official, durable and reliable.
However, looks are deceiving. Not only can counterfeit parts cost you money in the long run, due to premature failure or an unknown manufacturer who will not guarantee the part's performance, the shortcuts often taken in the manufacture of counterfeit parts could jeopardize your safety or the vehicle's performance. Some counterfeit brake shoes have been found deficient in braking power. Some counterfeit gas tank caps have no safety valves, designed to prevent spillage and fire in case of an accident.
How can you recognize counterfeit parts? Often, it's extremely difficult.