P2198 FORD - Oxygen Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1
Tech notesThere is a factory service bulletin for the following Ford models:
2010-2011 Ford Fusion
2009-2011 Ford Escape
Ford Factory Service Bulletin OBDII Code P2198
P2198 Ford DescriptionThe front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. A heated oxygen sensor (HO2S) indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
P2198 Ford Information for specific Ford models
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