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P0492

Secondary Air Injection System Insufficient Flow (Bank 2)

AIR system flow on bank 2 is below threshold during the cold-start self-test — typically a clogged check valve, leaking hose, or weak air pump.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: medium

Common causes

Ordered by how often each turns out to be the cause.

  • Check valve cloggedCommon

Parts involved

  • Secondary Air Injection Pump
  • Secondary Air Check Valve

P0492 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.