Lahore High Court Chief Justice Ijaz Chaudhry dismissed the petition on Friday and observed: "Statements by politicians do not affect court proceedings as they express their personal views".
Lawyer Rana Ilamuddin Ghazi had filed the petition in which he contended that Wahab had said during a news conference that Davis enjoyed diplomatic immunity.
He said Wahab knew that a case on Davis` diplomatic status is pending in the High Court and she should not have made such remarks.
Ghazi further contended that Wahab`s action amounted to contempt of court and he asked the court to initiate contempt proceedings against her.
Wahab lost her position as Pakistan People`s Party spokesperson after she told the media that Davis was entitled to diplomatic immunity and could not be arrested.
The Lahore High Court is set to hear a case on Davis` diplomatic status on March 14.
Davis was arrested in Lahore on January 27 after he shot and killed two armed men he claimed were trying to rob him.
The matter has been complicated following revelations that Davis was a security contractor working for the CIA.