The redesigned site's new stock locator feature offers customers stock list and details of over 13,000 vehicles registered for sale at auction centres across the country.
The service is free after registration, according to BCA.
Tim Naylor, PR Manager, BCA, said: "We know how time consuming it can be for buyers to find the exact car that meets their motoring needs.
"Our redesigned website makes it much easier for buyers to find out exactly when and where the precise vehicle they are after will be on sale at BCA.
"It is simple to use and cuts down the time spent on hunting for a used car."
Automatic alerts can be set up for certain makes or model of car, while a special BCA Showroom section provides details on prestige, sports and other special interest vehicles.
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