The city’s jail boss revved up the feds’ frustration with conditions at Rikers Island by missing a meeting with the Manhattan U.S. Attorney’s office and going to a car show.

Correction Commissioner Louis Molina skipped the April 14 meeting with Manhattan federal prosecutors — and later posted photos of himself smiling at the agency’s display at the New York International Auto Show at the Javits Center, sources told the Daily News.

Molina even tweeted pictures of himself at the car show with Deputy Commissioner Patricia Lyons and his security aide Captain Davelle Williams on his official Twitter account.

“After a 2 yr hiatus due to COVID, the NY International Auto Show is back and DOC will be in the building. Stop by to say hello and check out our fleet of vehicles that will be on display,” read the post on the DOC’s Twitter account.

Molina tweeted the pictures on April 15. But well-placed sources said the images were snapped the day before, when the meeting with the feds was held.

The absence of Molina and other officials from the meet up with Manhattan feds has helped put the city’s control of Rikers and its other jails at a crossroads.

Frustrated with the city’s handling of the problems at Rikers and other city jails, the U.S. Attorney’s office has threatened to seek an order putting the jails under court control.

In a letter filed in court Tuesday, lawyers working for Manhattan U.S. Attorney Damian Williams criticized Molina’s absence from the meeting on the Nunez class action lawsuit over the city’s use of force in its jails. A federal monitor oversees the city’s compliance with a settlement in the case reached in 2015.

“At our meetings on April 5 and April 14, the city and department advised that (they) ... were not prepared or willing to discuss specific implementation plans” to deal with the violence at Rikers, absenteeism among correction officers and other problems, prosecutors Jeffrey Powell and Lara Eshkenazi wrote.

“Neither the Commissioner nor any Department operational staff attended either meeting,” the letter said.

The Correction Department said in a statement that Molina’s presence was “neither requested nor required” at the April 14 meeting, which a spokesman said was really a “conference call.”

The prosecutors’ letter went on to press the city to step on the gas in its efforts to reform Rikers. A court hearing in the Nunez case is slated for April 26.

“Absent a commitment to expeditiously make the dramatic systemic reforms identified by the Monitor and to bring in corrections experts from outside the Department to revamp the agency’s operations and staffing practices, we will be left with no other option but to seek more aggressive relief, which could involve seeking the appointment of a receiver with independent authority to implement sweeping reforms,” the letter said.

Both Williams’ office and the federal monitor Steve Martin have been pushing the Department of Correction to hire outside experts to help run the agency, but Molina has instead hired several top officials from other city agencies with no correction expertise.

“Our office is very concerned about whether the Department and City have the ability, expertise, and will to swiftly make the changes necessary to bring true reform to this deeply troubled agency,” prosecutors wrote.

Nicholas Biase, a spokesman for the Manhattan U.S. Attorney’s office, declined comment Wednesday. The Legal Aid Society, which is representing the plaintiffs in the Nunez case, also declined comment.

The auto show started on Friday and goes through April 24.

Meanwhile, a detainee held at the Vernon C. Bain Center in the Bronx — a barge docked in the East River that houses hundreds of prisoners — was mistakenly released on Tuesday.

Sources said a paperwork error led to the release of Troy Belnavis, 32, of the Bronx about 12:20 p.m.

Belnavis had been arrested in Manhattan on March 6 on low-level drug charges. He was also wanted by authorities in Galloway, N.J. near Atlantic City for absconding on a 2020 drug case there.

Belnavis was supposed to be turned over to waiting New Jersey police, but he was simply let go, the sources said. The mistake was noticed about an hour later, the sources said.

Sources said Belnavis was apprehended after he went to police headquarters to retrieve his belongings, but the NYPD could not confirm that. Without identifying Belnavis or confirming any details, the Correction Department said someone “erroneously discharged” from the Bain center on Tuesday was apprehended on Wednesday after “an investigation.”