Somewhere between the other pulleys.
Pry up on the tensioner pulley.
You don't loosen it, you pry it back to remove tension.
Go to NAPA and buy a repair manual for your specific car.
The tension pulley is centerline with the engine and at the very top of the belt routing.
The 2006 Ford Focus has 16 valves.
Will be the only pulley that is spring loaded and not connected to an engine component
The 2006 Ford Focus is a gas-powered vehicle.
The 2006 Ford Focus has an inline 4 engine.
The 2006 Ford Focus has a 5-speed manual.
The height of the 2006 Ford Focus is 4 ft. 8.8 in. (56.8 in.).
The 2006 Ford Focus has double overhead cam (DOHC).
The 2006 Ford Focus's turning circle is 34.2 ft..