Question about 1998 Ford Expedition
It is under the intake manifold see picture below, it is the green part in center of engine valley between the heads.
Posted on Nov 05, 2012
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Posted on Jan 02, 2017
There are four o2 sensors on this truck. one on each side just below the exhaust manifold, and one on each side behind the second catalytic converters. (just about even with the back of the front doors.
Posted on Jun 18, 2008
SOURCE: o2 sensor location
DTC P0156 indicates the output voltage of the downstream Heated Oxygen Sensor (HO2S) is less than some calibratable functional window.
The possible causes are:
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Posted on Apr 16, 2009
polarcycle is right but there is a speed sensor on the drivers side top of the trans. toward the tail shaft or transfer case. there is as well a sensor inside the trans. itself that is mounted on the web. behind the overdrive band and drum.
Posted on Jul 11, 2010
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