9-3 Viggen Coupe (9400) L4-2.3L Turbo (B235) HO (1999)
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Oxygen Sensor: Description and Operation
Brief Description
Closed-loop fuel Injection system
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The catalytic converter has a high conversion ratio within a very narrow range. If the fuel-air mixture is not kept within this range, one or more
gases will exceed permitted limits. A closed loop fuel injection system guarantees a correct fuel-air mixture. The level of oxygen is measured by an
oxygen sensor that informs the Trionic or Motronic engine control module. The control module governs the fuel injection pulses so ensure the
correct fuel-air mixture. See Closed loop fuel injection system.
