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 Guelph, 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 Guelph and surrounding areas.
So what are you waiting for? Get in touch with us today!
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
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
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
I needed new tires, Emily was very helpful in the process and gave me several options with great prices. Had a few other services performed while they had my car. Everything was done as promised and my car was finished on time.
Geoff Whitteker Sep 9, 2025
⭐️⭐️⭐️⭐️⭐️ I recently brought my vehicle to True Auto Care Fergus for a safety inspection and some service, and I couldn’t be happier with the results. The team did a very thorough job and gave me a full, detailed report with pictures of everything they found. That level of transparency really builds TRUST, and it made me feel confident in the work being done. The service was professional and done right, and I especially want to thank Emily at the front desk. She was welcoming, friendly, and explained everything clearly, which made the whole process stress-free. I'm(KK) very satisfied with the work. Special shout-out to Mr. Skyler, the tech who worked on my car — he did a fantastic job, and now my auto is fully safe to drive and meets the new MTO digital safety standards. It’s not every day you walk out of an auto shop actually feeling good about the experience — but that’s exactly what happened here. True Auto Care definitely earned my respect and my recommendation. If you’re in Fergus Ontario or the area and want a shop you can rely on, this is the place to go. – Chevy TrucKK (KK) Lover 💪
Kristoff Kubinski Sep 9, 2025
Very happy with the service provided. Very reasonable prices and happy with the work thst was done
Lynn Jakeways Sep 9, 2025
Awesome service by keeping me in the loop as to timing and the service required. The ladies in the office were great and polite and greeted me with a friendly welcome. Thanks again and my truck is driving fantastic. Cheers
Brad Nesbitt Sep 9, 2025
This team got me in quickly when I needed my car repaired in a day! They were super accommodating and easy to communicate with. Highly recommend!
Mallory Earnshaw Sep 9, 2025
I cannot say enough good things about this place. Great customer service and friendly staff!! We will definitely be returning customers. My husband and I have been looking for an auto shop near us and I’m so thankful we found True Care Auto. If you are looking for an auto place near you, look no further. Best experience I’ve had yet with an auto repair shop!!
Patricia Azzopardi Sep 9, 2025
Such a great garage to deal with. My car broke down away from home and you guys did a great job getting me back up and going. I can’t say enough about how great my experience was. I even told you that when I was leaving. If you were closer to me I would 100% make you my go to garage. Communication about what was wrong and the repair was outstanding!!
Brenda Carter Aug 8, 2025
As always friendly service.
Joann Raine Nov 11, 2023
Excellent service. Fast and friendly. I would take my car here again.
Kerrigan Nealson Aug 8, 2025
Friendly, responsive and timely. My only critique is that I think they could have cleaned the windshield as part of the service and to show off their great work. Otherwise, well done.
Anita Zeitler Aug 8, 2025
Fantastic team! It's unheard of to get a BMW service bill under 3 digits. The team assessed my problem and came back with two options (one being take it to BMW for authentic parts). I chose their simple solution. Appreciated the option offering. Great solution and FANTASTIC cost. They've earned a new repeat customer!
EPG Evers May 5, 2021
They did an awesome job. They kept me in the loop the whole time, which I really appreciated. Friendly staff and great service, definitely going back!
Emerson Barrera Jul 7, 2025
Great service, quoted an amount and date of completion and they came below the quoted amount and were finished before the quoted date. Thank you
Stephen Dolby Jul 7, 2025
I have used this company many times and have always been happy with their work. Friendly staff, quick reliable service, even provided me a courtesy vehicle to use when my service went over a weekend.
Carol Ann Reid Jul 7, 2025
One of the best mechanics I’ve been to. Transparent with the quote and pricing and the work was done fast. I’m very happy with the work that was done.
Jennifer Scott Jul 7, 2025
The key to my exceptional service was my direct contact with the "front line staff". I was met with a smile, respect, understanding and gratitude. The work on car has made a noticeable difference in how the care handles on the highway. I also have maintenance suggestions for the future. Very professional ... I will definitely go back in the future!
Rachelle Campbell Jun 6, 2025
Another good experience with True Auto Care for me. Very professional people and no hard sell. My car is now ready for its drive to Vancouver!
Robert Turner Jun 6, 2025
Excellent staff and thorough with the automobiles. Also provide a listing of future items for attention.
Patrick Wieland Sep 9, 2021
They do a good job in a timely manner and fair price. Very approachable front desk staff who are very reliable.
Liz Huggins Jun 6, 2025
Prompt and courteous service.
Bill Baird May 5, 2025