Code Definition

P2097 — Post Catalyst Fuel Trim System Too Rich - Bank 1

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

About P2097

P2097 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 P2097 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

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 P2097 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

This fault code sets when the engine control module (ECM) detects an excessively rich air-fuel mixture based on the post-catalyst (downstream) oxygen sensor readings. The ECM continuously monitors the post-catalyst fuel trim to ensure proper emissions control. If the long-term fuel trim remains too rich beyond a calibrated threshold, the ECM logs this fault.

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