P2443: Secondary Air Injection System Switching Valve Stuck Closed (Bank 2)
4 vehicles · 2 makes · $300-$3,000 repair
Most Reported On
P2443 is an OBD-II diagnostic trouble code meaning “Secondary Air Injection System Switching Valve Stuck Closed (Bank 2).” This code is part of your car's emissions system. The secondary air injection system pumps fresh air into the exhaust right after a cold start to help the catalytic converter heat up and burn off pollutants faster. P2443 means the switching (changeover) valve that controls this airflow on Bank 2 — the side of the engine that does NOT contain cylinder 1 on a V-style engine — appears stuck in the closed position, so the expected air isn't reaching the exhaust. The computer detected this either by monitoring air pressure/flow or by seeing the wrong oxygen-sensor response during the cold-start air pump test. It's an emissions and inspection concern rather than something that will strand you. This code is most commonly reported on 2008-2019 Toyota Sequoia, 2008-2021 Toyota Land Cruiser, and 2008-2014 Subaru WRX STI, plus 1 other vehicle, with repair costs ranging from $300 to $3,000.
Common Causes
Typical Repair Cost
Based on 5 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2443, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (4)
Secondary Air Injection Pump Failure (3UR-FE/i-FORCE)
Secondary Air Injection Pump Failure (200 Series)
Secondary Air Injection System Failure (100-Series, 4.7L V8)
Secondary Air Injection Pump and Switching Valve Failure on 4.0L V6
FAQ
What does P2443 mean?
P2443 stands for "Secondary Air Injection System Switching Valve Stuck Closed (Bank 2)." This code is part of your car's emissions system. The secondary air injection system pumps fresh air into the exhaust right after a cold start to help the catalytic converter heat up and burn off pollutants faster. P2443 means the switching (changeover) valve that controls this airflow on Bank 2 — the side of the engine that does NOT contain cylinder 1 on a V-style engine — appears stuck in the closed position, so the expected air isn't reaching the exhaust. The computer detected this either by monitoring air pressure/flow or by seeing the wrong oxygen-sensor response during the cold-start air pump test. It's an emissions and inspection concern rather than something that will strand you.
What are the most common causes of P2443?
The most common causes of P2443 are: Stuck or seized secondary air injection switching/changeover valve (Bank 2), Carbon, moisture or rust buildup inside the valve or air passages, Failed vacuum or electric solenoid that operates the switching valve, Disconnected, cracked or collapsed vacuum hose to the valve, Failed or weak secondary air injection pump, Wiring or connector fault to the valve/solenoid, Clogged combination valve or check valve preventing airflow. The specific cause varies by vehicle.
How much does it cost to fix P2443?
Repair costs for P2443 range from $300 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P2443?
Au7o has documented P2443 across 4 vehicle models from 2 manufacturers: Subaru, Toyota.
Sources (4)
- owner-reportCarComplaints.com — Subaru Impreza owner complaints (includes WRX/STI years; search within for secondary air injection pump/valve failures and related CEL codes)
- videoYouTube - Secondary Air Injection Pump Replacement on 1998-2007 Toyota Land Cruiser by 4WD Mechanix
- TSBToyota Warranty Enhancement Program ZE3 for Secondary Air Injection System
- ForumTacomaWorld secondary air injection pump/valve failure thread
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.