Audi B7 A4 2.0T Crankshaft Position Sensor
The first operation a car's computer does when you turn the key is determine the position of the crankshaft. Ignition cannot take place without an understanding of where the valvetrain and pistons are at in their cycle - information the crankshaft provides.
When an engine struggles or fails to start, or when it feels down on power or responsiveness, the cause is oftentimes a failing crankshaft position sensor (CPS).
ECS offers several options to solve this highly disruptive but simple problem.
A Critical Little Sensor
Fits:
Audi B7 A4 2.0T (2005.5-2008)