Mass Air Flow (MAF) sensors measure the amount of air coming through your intake system. Aston Martins have two of them and they’re located just after the air filters. The measuring elements are extremely fragile and the sensors may need to be replaced if those elements are damaged.
These OEM sensors are sold individually, but I recommend replacing them as a pair to ensure their readings are comparably similar.
Replacing the MAF Sensors is a DIY job, but isn’t as easy as it should be.