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N43 is not a common platform on this forum, but it seems the 2AAF code does point to fuel pressure issues. What color is the smoke coming from the exhaust? If it's black, then you're getting excess fuel into the combustion chamber. Do you know if your mechanic reset adaptations after replacing the low-pressure pump? The car may have learned to run on the failing pump and now that it is back to full pressure, it is overcompensating (unless you reset adaptations).
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