Code Definition

P0492 — Secondary air injection system flow flow Bank 2

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

About P0492

P0492 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 P0492 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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 P0492 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 Powertrain Control Module (PCM) sets this code when it detects insufficient airflow in the secondary air injection system on Bank 2. This system injects fresh air into the exhaust to help reduce emissions during cold starts. A low flow condition may result from a failing pump, restricted passages, or a faulty control valve.

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