McLaren 720S Spider: What 120 Fault Codes Revealed About a Modified Supercar

A real diagnostic case involving modified ECU software, engine misfires and transmission problems. A 2019 McLaren 720S Spider with 49,357 km arrived at DEIZ GARAGE in Dubai with multiple dashboard warnings and several aftermarket modifications. The vehicle had modified downpipes, intake and exhaust components, and a third-party ECU calibration feat