He achieved this by using the VCDS (VAG-COM Diagnostic System) – a widely used aftermarket diagnostics tool for VW-Audi Group vehicles. His tiny circuit switches the lights between the two power ...

Read our full 2012 Audi A3 review for pros, cons, pricing, and expert insights. Our editors test drive over 200 vehicles a year to help car shoppers pick the right vehicle for them.

Audi's new compact A3 sedan delivers A4 refinement and poise in a compact package.