Expect poor power and possible stalling. If an aftermarket or recently re-oiled air filter is fitted, mention it — oil contamination of the sensor is a very common cause.
The airflow signal is lower than the sensor should ever report. A genuinely low reading means the module thinks almost no air is entering, so it cuts fuel accordingly and the engine runs lean and weak. The most common physical cause is contamination — oil from an over-oiled aftermarket air filter coating the sensing element is a classic, and it dulls the sensor's response rather than killing it outright.
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
P0102 means the MAF signal dropped below its plausible range — dead sensor, no power, or a signal wire problem. Not "reading a bit low": circuit-range codes are electrical complain...
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