P0410 Secondary air injection system A
What P0410 means
The engine control unit has found that the secondary air injection system is not working correctly. This system pumps fresh air into the exhaust for the first minute or so after a cold start to heat the catalytic converter faster.
P0410 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 100–500 €
- Workshop time
- 1–5 h
- Repair difficulty
- Medium
- DIY possible
- Yes
- Check engine light
- Yes
- Affects emissions test
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Check engine light on
- Loud whine or no sound from the air pump after a cold start
- Possible rough idle just after a cold start
- Emissions test failure
Common causes
- Failed secondary air pump, often from moisture ingress
- Stuck or leaking combination/check valve
- Faulty air pump relay or fuse
- Cracked hoses or a leaking vacuum line to the valve
- Carbon-blocked secondary air ports in the cylinder head
Can I keep driving with P0410?
You can keep driving, but have it checked within one to two weeks. A leaking check valve can let hot exhaust reach and destroy the pump.
What to check first
- Listen for the air pump running briefly after a cold start
- Check the pump fuse, relay and power at the pump
- Inspect hoses and the check valve for cracks, leaks or exhaust soot
- Replace the failed pump or valve and clear blocked ports if needed
Related codes
- P0411 Secondary air injection system incorrect flow detected
- P0406 EGR sensor A circuit high
- P0405 EGR sensor A circuit low
- P0404 EGR A control circuit range/performance
- P0403 EGR A control circuit/open
- P0402 EGR flow excessive detected
- P0401 Exhaust gas recirculation (EGR) A flow insufficient
- P0420 Catalyst system efficiency below threshold (bank 1)
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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