P2443AIR System Switching Valve Stuck Closed (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2443 signals that the bank 2 secondary air valve stays shut although the engine computer commands it open, so the second bank gets no added air during warm-up. Subaru lists the code for the 2011–2015 WRX STI and recommends always following the diagnosis for the opposite bank too, since valve or hose faults on one side can show up on the other. Toyota's 2UZ-FE bulletin covers only the bank 1 equivalent. Under CARB rules, each bank's air supply must be judged on its own wherever a blocked bank would raise emissions measurably. Common causes are a seized valve, a leaking vacuum supply or control solenoid, and kinked hoses. Expect slightly higher cold-start emissions and a failed readiness check; driving is normal. P2441 is the bank 1 code.
- What you may notice
- Check engine lamp after a cold start
- Secondary air readiness not set
- Likely causes
- LikelyBank 2 valve seized in the closed position
- PossibleLeaking vacuum line or faulty control solenoid
- RareKinked air hose on the bank 2 side
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €120 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.