SAN DIEGO -- A San Diego used car dealer already facing charges that he falsified tax returns for his business pleaded not guilty Tuesday to charges he understated his dealership's income by nearly $6.5 million.

Yousef Hoodneh, 60, was ordered held on $1.5 million bail.

The defendant is charged with six counts of state income tax fraud and "great-taking" allegations, said Deputy District Attorney Eric Ludwig.

Hoodneh's tax liability is $1.5 million in that case, the prosecutor said.

The defendant's pending case, in which he faces 14 counts of filing fraudulent state tax returns and aiding in the filing of false returns is scheduled for trial on July 20.

Tax liability in that case is set at $1.3 million, Ludwig said.

Hoodneh is listed as the corporate officer of the Flamingo Car Group Inc. and Flamingo Automotive Inc. at 9485 Black Mountain Road, according to the state Franchise Tax Board.

FTB agents allege that Hoodneh understated 2003 and 2004 corporate income by $6.5 million and failed to file a 2005 return reflecting $74,000 in income.

The defendant faces a maximum of 13 years in prison on each case if convicted, according to Ludwig.