LAPD Chief Charlie Beck made the announcement at a news conference Thursday night at LAPD headquarters.
On January 19, Stenroos told police a car-burglary suspect opened fire on him after he confronted the suspect.
The reported shooting prompted a lockdown at nine schools in the Woodland Hills area while police set up a 7-square-mile perimeter and searched for the alleged suspect. No suspect was located during the search, which took several hours.
There is no outstanding suspect in the shooting, the LAPD announced Thursday night.
Stenroos, who was wearing a protective vest at the time of the alleged shooting, claimed he was shot in the chest. He was treated at a hospital for a bruise to the head and other minor injuries.
A U.S. Coast Guard Auxiliary member rushed to the officer's aid Wednesday afternoon, using a police radio to call for help.
A composite sketch of the alleged shooter was released to the public.
Officials had offered $100,000 for information leading to the alleged gunman's arrest and prosecution.
Stenroos was to be booked into Men's Central Jail in downtown Los Angeles Thursday night.
The Los Angeles Police Protective League released a statement Thursday night:
"The law enforcement community is disgusted upon learning that Mr. Stenroos filed a false police report and apparently may have shot himself. His lies set into motion the largest search for a suspect in recent history and inconvenienced thousands of people for hours. While Mr. Stenroos is a disgrace to the badge, his individual and dangerous actions should not reflect on the hard working men and women in law enforcement. On behalf of all in law enforcement, we want to apologize to the public that a police officer would intentionally betray all of our trust. If these allegations are proven true, Mr. Stenroos is now where he belongs, behind bars."