Code Definition

P2198 — Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2 Sensor 1)

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2198

P2198 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2198 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2198 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Engine Control Module (ECM) continuously monitors the upstream wide band air fuel (A/F) sensor on Bank 2 to assess exhaust oxygen content and to maintain closed loop fuel control. Unlike a traditional narrow band oxygen sensor that simply switches between rich and lean, the wide band A/F sensor produces a linear output (typically a pump current that the ECM converts to a lambda value) that corresponds to the actual mixture ratio. DTC P2198 is set when the ECM determines that the Bank 2 Sensor 1 signal remains biased to the rich side and does not respond to commanded fuel trim corrections o...

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