Contact & directions
Call to book.
There is no form on this page on purpose. Appointments are recommended for the fastest service, and booking is one call to the number below, which rings at the shop, not a call center. Walk-ins are welcome at 111 N Stonestreet Ave during business hours if you have time and a little patience; a quick call first tells you whether there is room right now.
East Rockville, right by the tracks
Karnon Automotive
Mon–Fri 8:30–5:30- Monday8:30 AM – 5:30 PM
- Tuesday8:30 AM – 5:30 PM
- Wednesday8:30 AM – 5:30 PM
- Thursday8:30 AM – 5:30 PM
- Friday8:30 AM – 5:30 PM
- SaturdayClosed
- SundayClosed
Three things that make the visit faster
Tell us when it happens
Cold mornings, only at highway speed, only when turning left: the pattern is half the diagnosis. A phone video of the noise is worth a lot.
Leave a number we can reach
You get a quote before any work is done. If you are on the Metro or at a desk, we call or text that number and wait for a yes.
Coming for an inspection?
Bring the car with its lights, wipers and horn working if you can. They are on the state checklist and easy to overlook. If something does fail, it can be fixed and re-inspected here.
A visit, start to finish
Call to book, or walk in
Appointments are recommended and take one call. Walk-ins wait their turn, so call first if you want to know whether there is room right now. Tell the counter what the car is doing and a technician who speaks English, Spanish or French takes it from there.
We look
Lift, scan tool, road test: whatever the symptom needs. For a state inspection, the full checklist.
You get a number
A clear explanation and a fair quote, up front. Nothing is repaired until you say go.
Pick up
Many jobs are done the same day, parts permitting. We call when it is ready; pick it up on your way home from the station.
Serving Rockville & Montgomery County, MD, and anyone who rides the Red Line. Foreign and domestic, all makes and models.