P0410 fault code: what it means

P0410: Secondary air injection system fault (cold-start air pump system on some petrol engines).

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

failed secondary air pump
stuck or corroded secondary air valve
moisture in the pump or hoses
blown relay or fuse

P0410 by make

Mercedes-Benz

Secondary air injection fault. Common on Mercedes petrols with an air pump (cold-start emissions system).

Usual causes: failed secondary air pump; faulty diverter/combination valve letting exhaust into the pump; blown fuse, bad relay or corroded connector

What the repair usually costs

Glow plugs (diesel, set of 4)NZ$250–NZ$850 · A$250–A$850

Not sure what P0410 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.