P2443: Secondary Air Injection System Switching Valve Stuck Closed Bank 2
What to do
The car drives normally and will fail an emissions test. Worth repairing on that basis rather than urgently.
What this code means
The bank 2 switching valve is not opening when the system runs. As at P2441, this is the harmless half: no air delivered during the cold-start window, worse cold-start emissions, and nothing the driver will notice.
Likely causes
Start here
- Carbon deposits seizing the valve · moderate
- Faulty secondary air switching valve · moderate
- Disconnected or leaking vacuum hose · easy
Less common
- Blocked secondary air pipework · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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