Chelmsford Diagnostic Service has provided quality repair services for more than 20 years. Our experienced ASE L1 Master Technicians perform:

• Computerized Engine Diagnostics
• Computerized Wheel Alignments
• Tune Ups, Shocks, Brakes, Tires, Exhaust and Electrical Repairs
• Complete Maintenance Services at any Service Interval - You don’t need the dealership and it won’t void your warranty.

Massachusetts Enhanced Emissions & Safety Test and Repair Facility

Your car must be inspected for Safety every year and for emissions every two years. We are licensed to run these tests and repair those vehicles that fail. These tests are important to our environment and it’s another reason to keep your car well maintained.

Restorations and High Performance Services

Please click here to learn more about our other services.

About Bill Zaher

Bill is the owner and manager and has over 30 years of automotive service experience. He is an ITT Graduate and earned their “Top Troubleshooter” award. He is also ASE L1 certified and attends several workshops a year. He lives in Tyngsboro with his wife Joanne, and four children: Bethany, Christopher, Nathan and Sarah.