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Principle and function >
< Checking exhaust system for leaks
A4 Mk2
Power unit
8-cylinder direct petrol injection engine (4.2 ltr. 4-valve RS 4), mechanics
Exhaust system
Secondary air system
Secondary air system
Secondary air system
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.
Power unit
8-cylinder direct petrol injection engine (4.2 ltr. 4-valve RS 4), mechanics
Exhaust system
Secondary air system
Principle and function >
< Checking exhaust system for leaks
