If you ever wondered how VW/Audi made variable cam timing work? Ever had a trouble code for cam timing and didn’t know where to start? How does VVT work in general? How can I test VVT to see if it is working? What is inside a cam phaser? What is a central (4/3) valve? What is a bearing bridge? What do I do when output tests fail?
Audi A3 has been developed covering variants and functions for model years 2013 - 2014. This includes dynamic data, module information, fault codes, adaptations and routine functions across the range of drive, body, chassis and infotainment systems.
A secondary air problem is not always caused by the secondary air system. With the engine cold, start engine. If the secondary air pump runs and can be heard, the issue may be in the airflow control side.