Car mechanic utility on cellphone

In my experience nearly half the mechanical faults developed by our vehicles are easy to fix. We should be getting some basic car fixing engineering training from the authorities: A certificate course that comes bundled with the driving license. Until that becomes a norm, we could try one idea.

The modern day automobile has a microprocessor controlled engine. So we are steering a computer while driving. If my mobile has a software on it that interacts with the microprocessor of the engine - via, say Bluetooth - and that application would tell me roughly what or where the fault is, then may be I could have a go myself. That could save me time waiting for the mobile workshop to come around.