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| The secondary air system is designed to enable the catalytic converter to heat up and reach its operating temperature more quickly after a cold start. |
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| Because of the over-enrichment of the mixture in the cold start phase, the proportion of unburned hydrocarbons in the exhaust gas is higher. The secondary air system improves the afterburning (oxidation) process in the catalytic converter, and in this way reduces toxic emissions. The heat generated by oxidisation accelerates the light off of the catalytic converter and significantly improves exhaust gas quality during warm-up. |
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