Can the sheriff repo your car?

Yes, but only after he has legal paperwork from the Court. Sales contracts these days are designed to allow an easy repo by the seller to save costly delays, court costs to foreclose on your contract, and selling the vehicle at a Sheriff's sale.

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YES, when the sherif is involved it is when a "writ of Replevin" has been sought.

wiki "replevin" it is in most of the fine print of contracts.