| 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, causes afterburning and reduces the heating-up phase of the catalyst. Activation occurs from the Motronic control unit -J220- via the secondary air pump relay -J299- to secondary air inlet valve (-N112-, change-over valve) and combi-valve. |
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