In court Tuesday, 54-year-old Otis McKinzy Jr. pleaded not guilty to the charges.
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But Thursday, the Madera County District Attorney's office added allegations of "great bodily injury" to two of the counts he's facing.
Madera police say McKinzy tried to rob a woman in her 50s then carjacked, kidnapped and sexually assaulted her before she got away.
McKinzy is a registered sex offender and served 24 years in prison for another carjacking and kidnapping in 1997.
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He was out on parole.
McKinzy remains jailed with no bail.
A preliminary hearing is set for April 5th.