Question about 1996 Ford Taurus
Some models have two sensors, one before the catalyst and one after.
This is done for a catalyst efficiency monitor that is a part of the
OBD-II engine controls. The one before the catalyst measures the exhaust
emissions right out of the engine, and sends the signal to the PCM
about the state of the mixture as previously talked about. The second
sensor reports the difference in the emissions after the exhaust gases
have gone through the catalyst. This sensor reports to the PCM the
amount of emissions reduction the catalyst is performing.
Fig. 4: Typical oxygen sensor locations-3.0L OHC (4 valve) engine (click over pic for zoom)
Posted on Apr 06, 2011
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Posted on Jan 02, 2017
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