A South Florida woman is facing a stack of felony charges after investigators say she helped pull off one of the more brazen auto loan fraud schemes in recent Miami-Dade County memory. Dunia Sierra, 38, allegedly visited several car dealerships over an eight-day period and made off with a small number of vehicles, including a Corvette Stingray, a BMW i8, and three Harley-Davidson motorcycles. The only problem? According to officials, the income he put in his loan applications was completely made up.
Investigators with the Miami-Dade Sheriff’s Office Organized Crime Bureau Auto Crime Task Force say Sierra’s loan paperwork led to him pulling in more than $180,000 a month as general manager of a Miami Lakes restaurant. In fact, she worked there as a waitress and cashier and never held any kind of management role in the establishment. That’s promotion on paper.
Sierra was arrested Thursday and is being held on $26,000 bond. He is charged with organized fraud, grand theft and vehicle fraud. His case is just one piece of a larger investigation into what he describes as a sophisticated fraud ring involving dealership finance managers, auto brokers, and so-called “straw buyers” throughout Miami-Dade County.
What is a “credit bust-out” and how does it work?
Image credit: 7 News Miami.
At the center of this case is a plan type that financial researchers refer to as a “credit bust-out,” and the name is as dramatic as the plan itself. The idea is simple enough, though the execution requires some coordination: Participants quickly buy several high-value items, in this case vehicles, before those transactions have time to show up on their credit reports.
Because the credit bureaus don’t update in real time, there’s often a short window between when a purchase is made and when it actually appears on the buyer’s credit file. Fraudsters exploit that gap by racing to secure as many loans as possible before lenders can see the full picture they’ve taken. Add in false employment information and inflated income figures, and suddenly someone who doesn’t qualify for a single car loan is walking out of multiple dealerships with the keys to a fleet of luxury vehicles in a single week.
In Sierra’s case, that window appears to have been from Oct. 4 to Oct. 12, 2023, a period of just eight days when he received 10 vehicles, according to investigators. Financial documents reviewed by authorities in January 2026 confirmed the purchases.
Vehicle inventory is another matter
If you’re going to allegedly cheat, here’s a shopping list that suggests Sierra wasn’t thinking small. The vehicles he was linked to included a 2019 BMW i8 (a hybrid sports car that sold for $140,000 new), a 2023 Chevrolet Corvette Stingray, a 2018 Mercedes S560, a 2024 Kia Telluride, a 2024 Hyundai Graphite, a Palisade 2020 CX-9, a 2023 Toyota Highlander XLE, and three 2023 Harley-Davidson motorcycles. Two of the dealership transactions occurred within Miami-Dade County.
For context, the BMW i8 alone carries a sticker price that would traditionally require a very real six-figure salary to finance. Spread across 10 vehicles, the total loan value involved in this alleged scheme could likely run into the hundreds of thousands of dollars, if not more.
A large network behind the plan
Sierra is not the only person arrested in this investigation. Authorities say the alleged fraud ring involved finance managers working at car dealerships who allegedly helped push fraudulent loans by ignoring lending guidelines and violating their contracts with financial institutions. Those loans were also structured to be “front-loaded” with optional add-ons that generated higher commissions for the managers involved, giving them a direct financial incentive to look the other way.
Auto brokers were also allegedly part of the network, which helped connect straw buyers like Sierra, with individuals applying for loans in their own names on behalf of the scheme, with dealerships and lenders. The Miami-Dade Sheriff’s Office Organized Crime Bureau Auto Crimes Task Force continues to investigate, and Sierra’s arrest suggests the case is still developing. Anyone watching the used luxury car market in South Florida wants to pay attention to what comes next.
