Selling Cars on Facebook Marketplace Turned Into a Shocking Alleged Scam
Buying a used car online is supposed to save money, not turn your life upside down. But for at least eight people in Missouri, what started as a routine purchase on Facebook Marketplace ended with police reports, missing cars, and a criminal investigation that stunned local authorities.
Prosecutors say a 24-year-old man may have turned selling cars on Facebook Marketplace into a calculated scheme that left buyers without vehicles and without answers.
Prosecutors Say the Same Cars Were Sold, Then Taken Back
According to the Jackson County Prosecutor’s Office, Mamadou Diallo is now facing 14 felony charges after allegedly defrauding multiple buyers out of more than $24,000.
Between May and June 2025, investigators say Diallo sold vehicles to unsuspecting buyers using Facebook Marketplace. Each sale appeared legitimate. Buyers met him in person. They paid cash. They received titles and bills of sale that looked authentic.
Then something disturbing happened.
One by one, buyers reported that the very cars they had just purchased were stolen.
Mamadou Diallo repeatedly sold and re-stole a 2013 gray Honda Civic to unsuspecting victims, police say (Getty/iStock)
How the Alleged Facebook Marketplace Scheme Worked
Police say every report followed the same pattern.
Buyers found vehicles listed by an online alias. The seller was later identified as Diallo. After the transaction, the new owners drove away believing the cars were legally theirs.
Shortly after, those vehicles vanished.
Investigators believe Diallo used spare keys or retained access to the vehicles, allowing him to take them back after the sales were completed. The paperwork provided allegedly gave buyers false confidence that everything was legal.
Authorities say this method allowed him to sell the same car more than once.
Mamadou Diallo sold victims either a 2013 gray Honda Civic or a 2013 brown Buick Verano through Facebook Marketplace, police said
When Police Confronted Him, He Denied Everything
Detectives eventually interviewed Diallo about the incidents. According to court records, he denied buying or selling vehicles on Facebook Marketplace at all.
But prosecutors say the evidence tells a different story.
Diallo has been charged with six counts of first-degree tampering with a motor vehicle and eight counts of forgery, reflecting the repeated nature of the alleged crimes.
Nearly a Century in Prison Is on the Table
If convicted on all counts, Diallo could face up to 98 years in prison, according to prosecutors.
As of Tuesday morning, Diallo remained in custody on a $30,000 cash-only bond. He also has holds from sheriff’s offices in three other counties, signaling that this case may not be isolated.
Court records show he was previously charged in 2025 with multiple counts related to motor vehicle tampering, theft, and aggravated fleeing from police.
Why This Case Is Making Buyers Rethink Facebook Marketplace
Selling cars on Facebook Marketplace has exploded in popularity because it feels simple and personal. This case is a reminder that convenience can sometimes hide serious risks.
Experts urge buyers to verify vehicle titles through official state databases, avoid cash transactions without verification, and never assume paperwork is legitimate just because it looks real.
For the victims in this case, the lesson came at a devastating cost.
And for anyone scrolling through car listings online, the message is clear. Trust, but verify everything.
