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Fuel to air ratio

(1994 Mazda B2300)
in Gastonia, NC on June 24, 2009
Which sensor regulates the fuel/air mix and how much does it cost?
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Popular Answer
The mass air flow meter or a MAP sensor (Manifold Absolute Pressure sensor )measures air flowing into the engine and the computer makes calculations for fuel based on this reading. The Air/fuel ratio sensor or Oxygen sensor measures oxygen in the exhaust to determine combustion efficiency and tailors the air fuel ratio depending on this value. The airflow meter is about $350 from the dealer, the upstream O2 sensor is under $100.
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