Business Details
31 Years
experience
Your Trusted Auto Repair Partner in Lowell, MA
Chelmsford Diagnostic Service has been providing quality auto repair and maintenance services in Lowell, MA since 1995. Our ASE L1 Master Technicians combine over 30 years of experience with cutting-edge diagnostic technology to service all makes and models, including domestic and import vehicles. We specialize in AC repair, alignment, engine maintenance, and comprehensive diagnostics, ensuring accurate problem identification and efficient solutions. Our commitment to transparency includes detailed upfront estimates and honest recommendations for quality parts and services. As a licensed Massachusetts Enhanced Emissions & Safety Test facility, we handle inspections and repairs that meet state requirements while prioritizing environmental responsibility.The business owner, Bill Zaher, brings decades of automotive expertise and continuous professional development to maintain our high service standards. We guarantee all workmanship and stand by our reputation for fair pricing, quick turnaround times, and exceptional customer care. Our facility offers convenient amenities like free WiFi, refreshments, and same-day service for many repairs. With a focus on preventive maintenance and complex diagnostics, we serve both everyday drivers and specialty vehicle owners, including classic car restoration projects. Our team's dedication to excellence has earned consistent praise for trustworthy service and technical proficiency from satisfied customers across the region.
Services
AC Repair
Alignment
Brakes
Engine Maintenance
Tires
Transmission Services
Inspections
Electrical Systems
Suspension Work
Oil Changes
Details
- Year established: 1995
Highlights and features
- Over 20 years of automotive repair expertise in Lowell
- ASE L1-certified technicians with advanced diagnostic capabilities
- Detailed upfront estimates with no hidden costs
- Free WiFi, refreshments, and comfortable waiting area
- Accurate diagnostics for both modern and classic vehicles
Associations and certifications
- ASE (Automotive Service Excellence)
- Massachusetts Enhanced Emissions & Safety Test
What people say
Excellent service and fair price!
Trustworthy service at a fair price
Mechanics are knowledgeable and friendly
Accurate diagnostics on first visit
Quick turnaround times
Services
AC Repair
Our certified technicians diagnose and repair automotive air conditioning systems using specialized equipment. We identify refrigerant leaks, replace faulty components, and recharge systems to restore optimal cooling performance. Service includes comprehensive diagnostics and manufacturer-recommended maintenance procedures for both domestic and import vehicles.
Wheel Alignment
Computerized wheel alignment services ensure proper tire contact with the road surface. We adjust suspension angles to manufacturer specifications using advanced diagnostic tools. This service improves vehicle handling, extends tire life, and enhances fuel efficiency through precise calibration of steering and suspension components.
Brake Repair
Comprehensive brake system inspections and repairs cover pads, rotors, calipers, and hydraulic components. Our technicians perform complete brake diagnostics, recommend quality replacement parts, and follow strict safety protocols. Services include pad replacement, rotor resurfacing, and ABS system diagnostics for all vehicle types.
Engine Diagnostics
Advanced computer diagnostics identify engine performance issues through OBD-II systems. We interpret fault codes, analyze sensor data, and perform component testing to pinpoint mechanical and electronic problems. Our diagnostic process includes visual inspections and road testing to ensure accurate problem identification and effective repair solutions.
Transmission Service
Our specialists handle automatic and manual transmission maintenance and repairs. Services include fluid changes, filter replacements, and complete transmission overhauls. We use specialized diagnostic equipment to assess transmission health and perform repairs according to manufacturer specifications for both domestic and import vehicles.
People
Bill Zaher
Owner/Manager
With over 30 years in automotive service, Bill Zaher is an ASE L1-certified master technician and ITT graduate. He maintains continuous education through annual workshops and holds the ITT Top Troubleshooter award. Bill manages daily operations while ensuring technical excellence and customer satisfaction.
Questions
What types of vehicles do you service?
We service all domestic and import vehicles, including specialty Asian models. Our technicians also handle classic car restoration projects and high-performance vehicle modifications.
Do you offer warranty coverage on repairs?
Yes, we guarantee all our workmanship with warranty coverage that meets or exceeds industry standards for parts and labor.
Can you perform state inspection services?
As a licensed Massachusetts Enhanced Emissions & Safety Test facility, we conduct required inspections and perform necessary repairs to meet state compliance.
What maintenance services do you recommend?
We follow manufacturer-recommended schedules for oil changes, tire rotations, brake inspections, and fluid replacements. Our technicians also advise on condition-based maintenance needs.
How do you handle urgent repair needs?
While we don't offer 24/7 emergency service, we prioritize same-day diagnostics and strive to complete most repairs within one business day.
What payment methods do you accept?
We accept major credit cards, debit cards, and cash payments. Payment terms can be discussed with our service advisors before starting repairs.
Reviews (6)
Ben Knapton
Jun 02, 2022
Report
Fair prices, knowledgeable, dependable. I had a hard time finding a mechanic I could trust after moving to the area a few years ago. Bill is great, I bring all my vehicles here and refer people to him whenever I can.
Kan
Nov 24, 2021
Report
Trying to do inspection here, drain my battery and failed my inspection. Staff are rude and refused to do a free retest. Had to ask an police officer step in. Also receive many scam calls and mails after the first visit, should avoid any service here to protect your privacy.
Peter OToole
Feb 04, 2021
Report
In my opinion, the staff here are very unpleasant. I came in for inspection, they didn't do it right and so I couldn't get my MA plates. I came back to them and they told me it was my fault they did it wrong, they didn't offer to redo the work, and when I asked what I have to do to correct the inspection, they told me I should go to another inspection center and start from scratch. I did and everything was done quickly and with a smile. I recommend avoiding this place. There are many other businesses in the area offering the same services and they are much more helpful and pleasant to work with.
Colleen B.
Feb 01, 2021
Report
I have been gong to Chelmsford diagnostic for years for our cars. My husbands family have been going here for years. I find them friendly and knowledgeable about the cars Bill always tells me what I can wait one and needs to be done today to be safe. I love going here and I highly recommend them to all my family and friends.
Deidra Bradley
Apr 19, 2020
Report
The gods of auto mechanics have truly shined on me. Not only is Bill and his staff extremely talented and knowledgeable and fair but they are literally around the corner from my house which makes dropping off and picking up my car so much easier. Me and my boyfriend use him now and he is always timely Fair and knowledgeable. I had something wrong with my old car and he told me it wasn't worth fixing and that it was okay to drive it. That alone earned my trust forever. Be warned he's very busy and he might not be able to get you in immediately. But he's worth the wait.
Robert Innis
Jun 23, 2019
Report
Very satisfied and relieved. Bill and his team diagnosed and fixed a serious shifter problem with my 1997 Jetta. They performed the work as promised in the most professional and courteous manner. They will be my 'go to' shop from now on for both my cars. Great service and knowledge on their part. Many thanks to them.
