In the Subaru Outback automobiles, there is the Mass Air Flow Sensor which has the major duty of measuring the air mass that flows into the engine in the process of creating perfect results on the engine. This information is sent to the PCM which in turn controls the timing of the fuel injectors in order to achieve the right A/F mixture for combustion. Most Subaru Outback models have used Mass Air Flow Sensor of the Vane Meter (VAF) and Hot Wire sensors. The VAF sensor estimates airflow by using a mechanical vane and can be limited by restricted airflow and wear and tear. The Hot Wire sensor involves a heated wire the current of which changes when exposed to airflow; it provides high accuracy but is sensitive to contamination. Failures in the MAF sensor may lead to stalling and wrong air-fuel ratios and therefore lead to setting of the diagnostic trouble codes that switches on the CHECK ENGINE light.
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