Ya, at work we deal with vehicle diagnostic equipment and I have seen Semi trucks with disabled engines because of defective equipment connected to the diagnostic port. In this case the equipment had gotten wet and there was rust causing a short. Any noise on the diagnostic port can cause funny behaviour. Unplugging the unit corrected the issue luckily.
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View my fuel log 2015 Mirage SE 1.2 manual: 53.4 mpg (US) ... 22.7 km/L ... 4.4 L/100 km ... 64.1 mpg (Imp)