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Secondary Air Injection (AIR) system Checking Audi TT Posted: 07 Oct 2009 07:23 PM PDT Secondary Air Injection (AIR) system Checking Audi TT The heat produced by secondary oxidation greatly reduces start-up time for the catalytic converter, therefore improving exhaust quality during the cold start phase significantly. In the cold start phase, the ECM -2- activates the secondary air pump – 12- via the relay for Secondary Air Injection (AIR) pump [...] Secondary Air Injection (AIR) system Checking Audi TT

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