If you’re still relying on a cheap OBD reader, you’re missing the full story....

https://wiki-stock.win/index.php/Why_Diagnostics_Got_Harder:_The_20-Year_Shift_in_Vehicle_Electronics

If you’re still relying on a cheap OBD reader, you’re missing the full story. Modern cars are rolling networks where dozens of ECUs constantly talk to each other. When a warning light pops up, a simple code is rarely enough to find the real culprit