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Home >> Volkswagen >> 2001 >> Jetta GL, 2.0 S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (2.8L - Engine Mechanical, Engine Code: BDF) >> 26 - Exhaust System, Emission Controls >> Secondary air system >> Function

Secondary air system: Function

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During cold starting the secondary air system blows air in behind the exhaust valves. This produces an oxygen rich exhaust gas, causes afterburning and reduces the heating-up phase of the catalytic converter. Activation is performed by the Motronic Engine Control Module J220 via the Secondary Air Injection (AIR) pump relay J299 to the combi-valve.

Checking secondary air system → Secondary air system, checking  .

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