Ive had this problem for 4 months, 2017 2.0 A5 has done 59k, EML light first went on in November, garage did a DPF clean, EML light didn't come back on until I did a further 2k miles, its come back on a further 5 times, last time it took 400 miles to come back on, but the car has lost no performance, pick up and fuel economy absolutely fine, went through MOT no problem, emissions no problem, if I needed a new EGR cooler, wouldn't I have issues? Could it be something else? a sensor?