| The secondary air system blows air in behind the exhaust valve for 100 seconds during a cold start (+5 °C ... +33 °C coolant temperature). This produces an oxygen-rich exhaust gas, causing afterburning and reducing the heat-up phase of the catalytic converter. The Motronic control unit -J220- activates the secondary air inlet valve -N112- and combination valve via the secondary air pump relay -J299-. |
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