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Q: How many oxygen sensors do you have before the catalytic converter in my 2002 Ford Escape XLS 2.0L?
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How many 0 2 sensors are in a 1997 Ford Expedition Eddie baur?

I believe there are ( 4 ) Bank 1 is the passenger side of the engine , sensor 1 is before the catalytic converter ( upstream ) and sensor 2 is after the catalytic converter ( downstream ) Bank 2 is the driver side of the engine , sensor 1 is before the catalytic converter ( upstream ) and sensor 2 is after the catalytic converter ( downstream ) The 2 sensors before the catalytic converter are used for air / fuel ratio for the engine The 2 sensors after the catalytic converter are called catalyst monitors


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