Upstream o2 (oxygen) sensor. Should be directly behind your radiator, down low. It's the one in your exhaust manifold.
The 2001 Subaru Impreza has a flat 4 engine.
The 2001 Subaru Impreza has a 2.2 L base engine size.
The 2001 Subaru Impreza's engine produces 142 hp @ 5600 rpm.
The 2001 Subaru Impreza's engine produces 149 ft-lbs. @ 3600 rpm.
The 2001 Subaru Impreza has 16 valves.
The 2001 Subaru Impreza has a 5-speed manual.
The 2001 Subaru Impreza is a gas-powered vehicle.
The 2001 Subaru Impreza is 14 ft. 4.2 in. (172.2 in.) long.
The 2001 Subaru Impreza runs on regular unleaded.
The height of the 2001 Subaru Impreza is 4 ft. 7.5 in. (55.5 in.).
The 2001 Subaru Impreza has single overhead cam (SOHC).
The 2001 Subaru Impreza's turning circle is 33.5 ft..