In a news alert issued on Thursday afternoon, police said the description - that of a maroon or red sedan - may be "erroneous."
However, no other vehicle description was given.
This comes as police continue searching for four suspects in connection with the beating death of 23-year-old Kevin Kless.
Police say around 2:25 a.m. Saturday Kless was walking in the 400 block of Chestnut with his girlfriend and a second woman trying to hail a taxi.
Kless had a negative exchange with a cab driver. Then, police think, men in a car behind the taxi may have said something inappropriate to one of the two women with Kless.
Police theorize his verbal response may have triggered the deadly attack.
The suspects are described by police as:
Suspect #1: Light complected male, possibly Hispanic, 20 years-of-age, 5-10", thin build, wearing a white shirt with blue stripes.
Suspect #2: Light complected male, possibly Hispanic, 20 years-of-age, 6'0", medium build, maroon shirt.
Suspect #3: Light complected male, possibly Hispanic, 6'2", no further information.
Suspect #4: Light complected male, possibly Hispanic, no further information.
Police are once again urging the driver of the mystery car to come forward and help himself with the District Attorney.
Witnesses say he never took part in the deadly beating.
Rewards worth $20,000 are being offered for information in this case.
Anyone with information can call Philadelphia Police at 215-686-TIPS (8477) or the Citizens Crime Commission at 215-546-TIPS (8477).