Can a mechanic withhold your car for nonpayment for another car?

Yes, a mechanic can withhold your car for nonpayment, but typically only for services rendered on that specific vehicle. If you owe money for repairs on a different car, they generally cannot withhold your current vehicle as leverage for that unrelated debt. However, laws can vary by state, so it’s important to check local regulations regarding mechanics' liens and nonpayment practices.