Annual checkups from your physician keep you in good health, right? The same goes for your car—regular diagnostic tests can detect problems with your vehicle before they require expensive repairs or, worse, leave you stranded on the side of the road after a breakdown.
Typically, a car diagnostics test refers to the process where each part of an automobile is deeply examined and thoroughly checked to capture the root cause of any issues inside an automobile. It involves using special software to highlight the causes or faults and issues that are causing problems to your vehicle’s engine or elsewhere. This can be detected due to built-in processors, microchips, and sensors.
This is the first thing we check when a customer enters the True Auto Care shop with an issue is OBD. OBD is an abbreviation for On-Board Diagnostic. It is the standardized system that allows external electronics to communicate with a vehicle’s computer system.
It has become more important as automobiles have become increasingly computerized, and software has become the key to resolving many issues and unlocking performance.
Diagnostic tests can reveal issues with a car’s engine, transmission, exhaust system, brakes, and other major components like fuel injector, air flow and coolant, ignition coils, and throttle performance.
A common misconception about car diagnostic tests is that technicians can use code-reading tools to pinpoint the problem that caused the check engine light to illuminate.
In reality, the code informs technicians about which engine or component parameters are out of range, but it does not explain why. That’s where the technician’s experience and expertise come in handy, as the technician uses their knowledge to diagnose the underlying problem.
Most full diagnostic tests can take an hour to 90 minutes to complete. However, occasionally, issues arise that complicate matters or your vehicle may have components that must be removed before a diagnostic test can be performed. Therefore, the time could range between two and three hours.
Before the invention of car diagnostic tests, identifying problems was time-consuming and costly, especially since car owners only took their vehicles to mechanics after a breakdown or other severe malfunction.
Mechanical automobile components can now detect problems long before they cause a breakdown. Diagnostic tools can also search a vehicle’s computer system for manufacturer notifications and store information about the vehicle’s history, providing technicians with a complete picture to perform the best repair possible.
If you are looking for the best-in-class auto repair and maintenance services in Fergus, ON, you are in the right place. True Auto Care, a well-reputed automotive shop with the best automobile technicians, can assist you with relevant auto diagnostic programs and ensure the smooth operation of your vehicle. True Auto Care serves customers’ automotive repair and new tire needs in Fergus and surrounding areas.
So what are you waiting for? Get in touch with us today!
Always a pleasure going to True Auto!! Friendly and great service at an affordable price.
Steve H Dec 12, 2025
Recommended by my family. It's evident why. A refreshing combination of professionalism and courteous services.
Vic Cabeldu May 5, 2026
Service was excellent! Thanks so much for fitting me in on such short notice and thanks for the cookies Skylar!!
Veronika George May 5, 2026
Timely and efficient with good follow up.very friendly.
Bonnie Weber Apr 4, 2025
True Auto comes through again 300,000 km on my car I bring it in only when I need to change my tires in winter and summer I know i'm supposed to bring it in more regularly but I haven't needed to because the car just keeps on running I Drive an hour to work everyday, all backroads and haven't been stranded in 11 years Thank You Jenna and Team at True Auto
Mike Babin May 5, 2023
Excellent service. Work was completed on time at the expected cost.
Norman Lord May 5, 2026
Work done on time for price quoted. Staff were pleasant and helpful.
David Strang May 5, 2026
Great service recommended garage to a neighbor and she took her car there. She was amazed at the great service.
Susan Barth Sep 9, 2025
Great auto shop. Front desk was great and friendly. The car was repaired fast and car was clean you would not know they where ever in it
ranchuk home Mar 3, 2026
Super nice and helpful staff! They fit me in to look at my car in a pinch after being turned down by 3 other auto shops.
Maresa Bell Feb 2, 2026
Great experience, exceptional follow up- and most importantly excellent work quality.
Michael Woodrow Feb 2, 2026
True Auto Care is a great place to have your car fixed.They have an efficient process in which they do a complete assessment of the vehicle and text you their findings so you decide what work to have done. Responsive friendly staff. Great experience.
Polly Feb 2, 2026
True Auto Care helped me last Friday when I had an auto emergency. They were able to get me in and get me on the road back home with friendly advice. Technician Skylar was really knowledgeable and went above and beyond to help!
Carolyn Roy Feb 2, 2026
A very well managed local company and is a pleasure to do business with
John Krasko Jan 1, 2026
Great service 👍
Julie Bissonnette Nov 11, 2023
The service was lovely. They were able to get my car in quickly and I really appreciate the 360 inspection. They worked with me to do the services in a timely manner with taking cost into consideration. I will continue to come here with all of our vehicles.
Dana Reed Jan 1, 2026
Thank you Jenna and all the staff at True AutoCare! We feel safe in your hands and we would never go anywhere else!!
Linda Babin Nov 11, 2023
True Auto Care has been my vehicle repair service provider for more than a decade. They have earned my trust with ever repair, big or small, and they treat me with respect every time. I value their work and I feel confident in their advice and in their repair services. This is what a family business is all about.
Kelly Waterhouse Oct 10, 2020
The front desk staff were absolutely amazing and they were as effective as can be. Very professional a d quick. They really know what they are doing. Thank you again to all of you.
gervais corriveau Dec 12, 2025
Overall great experience. Highly recommended. Very informative website and excellent customer service
Christine Mission Dec 12, 2025
Appreciated the flexibility and communication. Overnight drop off helped, and the texted report post inspection with follow up phone conversation helped me sort through options. Clearly the desk staff are knowledgeable and care, and the mechanic did thorough work.
John Cumming Dec 12, 2025
Great service! Janelle and Jenna are lovely. They are very responsive and accommodating!
Ali Darling Dec 12, 2025
Always an amazing job done here! Only auto place I trust with my car, Skylar goes above and beyond on every little job and always recommends the best parts! If you’re looking for a trustworthy auto shop with the best prices then you found it! Don’t hesitate just call and see for your self!
john clark Nov 11, 2025
Very Profesional, Polite, Friendly, and Reasonably Priced Good Old Fashion Service. The Best of the Best!! Happy to know True Auto Care!
Andreas Roussos Nov 11, 2023
They are very quick, professional and very reasonably priced not to mention they are very friendly to work with
Kevin Fitzner Nov 11, 2025
Exceptional customer service. Windshield looks amazing
Leyanne Durante Nov 11, 2025
The True Auto truly is the best service I’ve ever had, Phil.
Philip England Nov 11, 2025
Always fast and friendly service
Michael Davis Jun 6, 2024
Wonderful experience, the girls at the front desk are patient and kind. The service was done well, on time. We pre-booked the snow tire removal and switchover for the spring. The owner is very friendly and kind and the courtesy service was super helpful on a busy day. Would absolutely recommend for anyone!
Karley Gainey Nov 11, 2025
The staff is very knowledgeable and understands my needs. When working on the car they informed me of other issues that needed to be done and gave me an estimate of the additional cost before proceeding with the work. I am satisfied with their work. Bob Skeoch
Bob Skeoch May 5, 2023
Five stars for Emily. I thoroughly enjoyed our banter. Hope you're doing well, Emily!
Andrew Soulsby Nov 11, 2025
Great service as usual!
Peter Mandic Oct 10, 2024
Excellent !! I am treated great from start to finish whenever dealing with anyone on the team and I’m super confident that my car is being well looked after. Thank you all !!
Brett Shantz Oct 10, 2025
Booked next day appointment which was awesome. Reasonably priced Alignment. I was on my way in a timely manner.very efficient
stephan fokuoh Oct 10, 2025
Great service- was able to get everything done on a short notice. Trustworthy and competent. Using them for my vehicles for more than a decade!
Li Chang Oct 10, 2024
Great job and friendly service.I rate them a ten.
Daniel Burke Nov 11, 2022