DTC P2198: O2 Sensor Signal Biased/Stuck Rich: Bank 2, Sensor 1

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DTC P2198: O2 SENSOR SIGNAL BIASED/STUCK RICH: BANK 2, SENSOR 1

Description:	A heated oxygen sensor (HO2S) indicating rich at the end of a test is trying to correct for an over lean condition. This DTC sets when the fuel control system no longer detects switching for a calibrated amount of time.
Possible Causes:	Electrical: HO2S harness short to voltage Water in the harness connector HO2S circuit open UO2SPC circuit open Corrosion Incorrect connections Damaged HO2S Damaged PCM Fuel System: Excessive fuel pressure Leaking or contaminated fuel injectors Leaking fuel pressure regulator Low fuel pressure or running out of fuel Evaporative Emission (EVAP) system: EVAP purge valve stuck open Vacuum leaks Positive crankcase ventilation (PCV) system Incorrectly seated engine oil dipstick Exhaust Gas Recirculation (EGR) System: Leaking gasket Stuck EGR valve Leaking diaphragm or EGR vacuum regulator Base Engine: Oil overfill Cam Timing Cylinder compression Exhaust leaks before or near the HO2S
Diagnostic Aids:
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST H .