9-3 Arc/Aero (9440) L4-2.0L Turbo (2.0 T) (2004)
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The signal value of the second sensor is also used to adjust the lambda control to compensate for minor faults in the first sensor.
The best emission values are obtained when the voltage from oxygen sensor 2 is 0.6V.
If the voltage is, for example, 0.3 V the engine has a slightly weak mixture. The lambda control factor will then be locked in the rich condition for a
certain number of cycles before the voltage from sensor 1 is allowed to influence the factor again.
