Audi
Secondary air injection bank 1 flow too low. Cold-start emissions only.
P1423 fault code: what it means
P1423: Secondary air injection bank 1 flow too low. Cold-start emissions only.
Usual causes, most likely first
- failed secondary air pump
- stuck combi valve
- collapsed vacuum hose
- pump fuse blown
P1423 by make
BMW
Secondary air injection bank 1 flow too low.
Skoda
Secondary air injection bank 1 flow too low. Cold-start emissions only.
Volkswagen
Secondary air injection bank 1 flow too low. Cold-start emissions only.
What the repair usually costs
- Glow plugs (diesel, set of 4)NZ$250–NZ$850 · A$250–A$850
Not sure what P1423 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.