Does a 7.3 have a MAF?

7.3 does not have an MAF sensor, so that isn't the problem. We'll need to know what code it is setting to help, otherwise there are several hundred things that will turn the check engine light on. via

Does a MAF affect turbo?

Sensors for turbo-diesel engines in particular are subjected to high stresses since airflow and speeds are very high. A defective or clogged MAF sensor can supply incorrect input signals to the engine control unit (ECU) which, as a result, controls other components incorrectly. via

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