Question about 2005 Ford Escape
The O2 sensors are located underneath the vehicle if you fallow down the exhaust manfifold pip that will bring you right two them depending if you have one or two Bank one are located before the catalytic convertor an bank 2 are located right behind it so it would be the sensor farthest from the engine bay and closest to the muffler but right after the cayalytic convertor it will have 4 wires in your case and its a simple replacement just make sure its done when everything is cold all you need is a wrench 7/8 usually or purchase a O2 sensor socket wrench for a few dollars good luck
Posted on Sep 24, 2009
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Posted on Jan 02, 2017
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Fig. Fig. 3: Oxygen sensor-4.3L engines
Fig. Fig. 4: Oxygen sensor-5.0L and 5.7L engines
Fig. Fig. 5: Oxygen sensor-7.4L engines
Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (the one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
Hope helps (remember to rate this).
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