Air flow sensor: Air flow sensor. It detects how much air is flowing into the engine.
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It measures the air mass and it is useful for the ECU because it can calculate exactly how much oxygen is entering into the engine. With this information, the ECU regulates the engine parameters to ensure its right performance. The sensor is placed in the inlet manifold, just behind the throttle body.
Crank, no start. No spark, no fuel activity. 1st code p171. Replaced MAF, both O2 sensors, pcv, iridium spark plugs twice, oil change and both oil/air filters.