Code Definition

P2096 — Post Catalyst Fuel Trim System Too Lean - Bank 1

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

About P2096

P2096 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 P2096 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 P2096 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 fault code P2096 is set when the Powertrain Control Module (PCM) detects a lean condition in the engine's fuel mixture, specifically on the post-catalyst side, in bank 1. This condition is identified through the oxygen sensor's readings which indicate that the oxygen content in the exhaust is higher than expected, suggesting incomplete fuel combustion or excess air in the engine. The code is set when this lean condition persists over a specific period or under certain driving conditions, indicating potential issues with fuel delivery or air management.

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