Hi
Right, having the fault codes reset will not have an effect on your emissions. Having your engine adaptations reset might, in which case they'll be recalibrated between 30-50 miles of varied driving, but if there was an emissions related fault in the memory that hasnt been rectified then it's only a matter of time before the light reappears.
What i your year, model and engine?
What were the fault codes that were stored?
Rich.
Hi,
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BMW Technician
5 years main dealer experience.