How many miles do you have to drive your 2002 ford ranger for a smog check?

There's no mileage requirement for a smog check on a 2002 Ford Ranger (or any vehicle). Smog check requirements are based on the vehicle's age and location (state/county). You'll need to check your state's Department of Motor Vehicles (DMV) website for the specific requirements in your area. Some areas might require it annually, others biennially, and some might have mileage-based exemptions for older vehicles, but there's no universal mileage threshold.