The 14th Street bus is bus-ted.

A court-ordered injunction halting the city’s plan to ban cars from sections of 14th Street has “greatly impacted … service” and “caused public confusion,” according to testimony filed by the MTA in court on Monday.

The car ban was scheduled to go into effect on July 1 along with the start of the MTA’s “Select Bus Service” program — until Judge Eileen Rakower put the kibosh on it three days before launch.

With other elements of the Select Bus program — such as off-board fare machines and reduced stops — already in place, the MTA “reluctantly” opted to go ahead with the service changes against the better judgment of transit officials, according to Monday’s filing by New York City Transit chief planner Judith McClain.

“[We] would have had significant reservations … had [we] known that the bus lanes and traffic restrictions would be enjoined right before the launch,” McClain wrote.

The Select Bus Service program has sped up buses on 16 routes since it launched in 2008, but the 14th Street route is the first to debut without dedicated bus lanes.

Transit advocates agreed that the lack of priority space for buses has erased any potential benefits of the Select Bus program.

“There has been, as far as I can tell, no improvement in service at all,” said Riders Alliance policy and communications director Danny Pearlstein.