Secondary air injection
Secondary air injection: the pump that blows air into the exhaust for the first minute or so after a cold start, so the catalyst reaches working temperature sooner. The rest of the time it does nothing — and that is normal.
3 codes in this section, 3 with a guide
What it usually turns out to be
- A loud whirring under the bonnet for the first seconds after a cold start is the system working, not a fault.
- The code appears once a day, at the first morning start: that is the only time the system runs.
- While the code is active the self-test does not complete — and the emissions test fails with clean exhaust.
P0410Secondary air injection system — malfunctionguideP0411Secondary air injection — incorrect flowguideP0412Secondary air valve — circuit malfunctionguide
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Other sections
Fuel and air metering, general 33Intake measuring sensors 17Oxygen sensors 19Throttle and accelerator pedal 15Mixture: lean and rich 11Fuel and air metering: injectors 25Ignition system and misfires 29Exhaust gas recirculation (EGR) 7Catalytic converter 4Canister and purge valves 9Fuel vapour leaks 7Fuel level in the tank 4Diesel particulate filter 6Idle and auxiliary systems 22Control module and its circuits 21Transmission 17Communication between modules 20Brakes, ABS and stability control 17Body, airbags and lighting 12