P2440 — Secondary air valve stuck open on bank 1
The code indicates the secondary air injection valve on the first engine bank is stuck open. This valve helps reduce emissions by injecting air into the exhaust during cold starts. If it stays open, it can cause poor engine performance, increased emissions, and possible check engine light.
Common causes
The cause is almost always one of a few things. Here they are — P2440 rarely comes from anything outside this list:
- Faulty secondary air injection valve
- Wiring or connector issues to the valve
- Blocked or damaged air injection hoses
- Faulty air injection pump or relay
- ECU software or sensor malfunction
Where to start
In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:
- Inspect and test valve electrical connections
- Check air injection hoses for blockages or damage
- Test secondary air injection valve operation
- Replace faulty valve if necessary
- Check and repair air pump or related components
That is what holds for P2440 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
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Code breakdown
🔧 Related repair procedures
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- AUDI: Removing and installing catalytic converter
- AUDI: Removing and installing front exhaust pipe (left-side) with catalytic converter - vehicles with multitronic gearbox
- AUDI: Removing and installing catalytic converter - vehicles with two turbochargers
- AUDI: Removing and installing catalytic converter with exhaust pipe - vehicles with engine code letters AVF, AWX
- AUDI: Checking Lambda probe and Lambda control after catalytic converter
- VW: Removing particulate filter with NOx storage catalytic converter
- AUDI: Removing and installing front exhaust pipe with catalytic converter and front silencer
- AUDI: Removing and installing Lambda probes (before catalytic converter)
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
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