WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
SPECIAL TOOL
Exhaust Back Pressure Gauge 309-D002 (D95L-6000-A) or equivalent
Socket, Exhaust Gas Oxygen Sensor 303-476 (T94P-9472-A)