Diagnostics & Testing
We offer a variety of testing and diagnostic services to collision repair shops and auto repair shops. We also offer services to consumers and will do house calls to diagnose warning lights.
We have 30 years of experience in the automotive industry
An automotive technician with 30+ years experience. Reliable, licensed and fully insured. I can diagnose issues for you so you are assured to save time and money.
Kelley Maddison2024-09-08Exceptional Service and Expertise! I had the pleasure of working with On Site Diagnostics for some transmission diagnostics, and the electronic control systems programming for our power windows. I couldn't be more impressed with the level of service I received. From start to finish, the service was professional, knowledgeable, and incredibly efficient. The issue was quickly identified and everything was explained in clear terms, making sure I understood the necessary repairs. The attention to detail gave me complete confidence in their work. It's rare to find a company that combines expertise with such excellent customer service. I highly recommend them to anyone in need of someone reliable. Thank you for a job well done!
Steve Kurylo2024-09-07Exceptional diagnostic skill set. Fast response time with latest equipment and proper diagnostic and programming support. Theses are the guys to call!!
Cristal2024-09-07Very quick to respond to request for diagnostics, showed up when he said he would, diagnosed at a very reasonable cost! Would highly recommend this service, all around great experience!
Mark Medeiros2024-09-07Best Mechanic in the area! He has excellent attention to detail. Great with electrical and mechanical work. He is my go to for all auto care needs. Great to have a person you really trust for auto care! I highly recommend Cormac for anything automotive related!
Greg West2024-09-07Best mechanic in NH..... no questions asked!
Rusty Resto2024-09-07Excellent service , came out to look at a particularly obscure electrical issue that had stumped a few other diag guys... located the issue and repaired it for a very reasonable cost ..highly recommend Cormac to repair anything ..
Courtney Caudle2024-09-07Absolutely amazing. Knowledgable in so many areas and a pleasure to deal with. Bought a used BMW and the sunroof would not open to the vent setting. I was worried about a big repair but somehow it was fixed in no time at all after running the scan and resetting something (I’m clearly not able to articulate what was done and that’s why I rely on the experts)! Thanks again!!
Brittany Callahan2024-09-07On Site diagnostics is very reliable and the only place I trust to bring my car. Honest business and honest owner. We have gone to him for many years.
Brian Callahan2024-09-07I’ve been working with Cormac for 7-8 yrs. He is the most honest, reliable, experienced mechanic I’ve ever worked with. He’s done some major repairs for me with great efficiency which otherwise would have tied up my vehicles elsewhere for several weeks. I would highly recommend him for any mechanical challenges.
Abigail Giotas2024-09-07Cormac has worked on our vehicles many times over the years. He is always prompt, professional and honest. He is our go to when something happens, whether the issue is obvious or not. I had a weird sound occurring last year in my CRV and he was able to quickly and accurately figure out what was wrong using his equipment. 100% recommend On Site Diagnostics.
