Modern vehicles are basically rolling computers. When a warning light pops up,...

https://dlf-ne.org/beyond-the-code-what-an-advanced-diagnostic-platform-actually-does-for-your-shop/

Modern vehicles are basically rolling computers. When a warning light pops up, a basic code reader only tells you a small part of the story. You need professional diagnostic software to talk to every ECU and view high-speed live data in real time