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15 Months out of warranty on 2016 N63tu GC with 61K on the clock. Some money and work (mostly done in my home shop) was spent chasing low rpm load misfires at highway speed and upon downshifts at VERY high speed no codes were thrown for quite some time. After real time diagnostics over several days of driving, erratic fuel trim levels pointed to post CAT 02 sensors, once replaced the fuel trims settled and the car has run butter smooth in the 7 months since. Replaced plugs, coils, injectors, fuel pumps etc., etc chasing the issue on recommendation of the shop foreman at my dealer....
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