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A lambda or oxygen sensor in the exhaust works by

  • A.Measuring the exhaust temperature
  • B.Counting particulate emitted
  • C.Measuring the fuel flow directly
  • D.A sharp switch at stoichiometric

Answer: D

A zirconia cell produces a large step in output as the residual oxygen disappears, which makes it an excellent switch but a poor absolute meter. The control system uses that step to hunt continuously around the stoichiometric point.

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