E 420 (210.072) V8-4.2L (119.985) (1997)
Climate Control Exhaust Gas Sensor: Description and Operation
The smog sensor switches to 100 % recirculated air via the push-button control module when the following conditions are fulfilled:
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60 seconds after ignition ON
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activated charcoal filter switched on (LED illuminated)
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high CO-/NOx quantity in outside air
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EC mode not switched on
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outdoor temperature > 7 °C
Function