Once in service, the car is diagnosed using a computer and its available OBD port. For a while now, various electronics manufacturers have begun offering OBD tools to everyone willing to buy them.

Using the OBD II port, it gathers and displays information such as boost pressure, transmission temperature, and fuel-flow rate in real time.

The OBD (On-Board Diagnosis) system in your Toyota Corolla will enable you to see what’s wrong with it without going to the service if you choose the low-budget DIY way.