Service Item Query - Fuel Injection System

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2018 CX5 SE-L Nav+ 2WD 2.2D 150hp Auto
Hi all

Just had my first service on my 2.2 Diesel Auto. There's one item on the service list I don't understand, - "Fuel Injection system, update to injection amount correction with Mazda Diagnostic Tester". Is this some form of re - calibration after 1 year?
 
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