Possible Causes

WARNING: This page is about a different car, the 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Monitor description . Mass air flow sensors left/right flow to low
This DTC is set when the powertrain control module has measured a signal voltage below a specified range but not necessarily a short circuit to ground, gain too low.

Blocked air filter
Other related Diagnostic Trouble Code(s)
Air induction system, incorrectly installed components, loose hose clips or air leakage
Mass air flow sensor contamination by oil or debris
Electric throttle blade contamination by oil or debris
Mass air flow sensor circuit, short circuit to ground, short circuit to power, open circuit, high resistance
Throttle adaption failure