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P0492 fault code: what it means

P0492: Secondary air flow too low, bank 2. Cold-start emissions only.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. failed secondary air pump
  2. stuck secondary air valve
  3. split air hose

P0492 by make

BMW

Secondary air flow too low, bank 2. Cold-start emissions only.

Usual causes: failed secondary air pump; stuck secondary air valve; split air hose

Porsche

Secondary air injection bank 2 flow too low. Cold-start emissions only.

Usual causes: failed secondary air pump or relay; sticking air or change-over valve; vacuum leak; blocked air hose

What the repair usually costs

Not sure what P0492 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.