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Where is ho2s sensor 2005 ford freestyle - Ford Cars & Trucks

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The oxygen sensors are always in the exhaust stream somewhere. Some have 2, some 3, and some have 4 O2 sensors. The HO2 sensor means it is a heated oxygen sensor, there is a small separate heating element in the sensor for faster response times, like when engine is cold.
Depending on the manufacturer and the specific vehicle, you will have 1 or 2 sensors near the engine in the exhaust, but before the catalytic converter. These sensors are used to keep track of the air/fuel mixture that is burned in the engine, it is feedback for the computer to either add or subtract the amount of fuel through the injectors. The idea is to keep the mixture at the optimum for efficient burning.
Now after the catalytic converter you will also have another oxygen sensor, but this one serves a different purpose-it is only there to monitor the efficiency of the cat in terms of it converting unburnt hydrocarbons into carbon dioxide.

Posted on May 14, 2017


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