P2442: Secondary Air Injection System Switching Valve Stuck Open (Bank 2)
6 vehicles · 3 makes · $100-$3,000 repair
Most Reported On
P2442 is an OBD-II diagnostic trouble code meaning “Secondary Air Injection System Switching Valve Stuck Open (Bank 2).” This is an emissions-system code, and it's the opposite condition of P2443. The secondary air injection system briefly pumps fresh air into the exhaust after a cold start so the catalytic converter warms up and cleans pollutants more quickly. P2442 means the switching (changeover) valve on Bank 2 — the cylinder bank that does not contain cylinder 1 — appears stuck in the open position, allowing air to flow when it shouldn't. The computer detects this through pressure/flow sensing or by seeing an oxygen-sensor reading that's leaner than expected when the air pump should be off. It's an emissions and inspection issue, not a drivability emergency. This code is most commonly reported on 2001-2009 Toyota Sequoia, 2003-2009 Lexus GX (GX470), and 2008-2021 Toyota Land Cruiser, plus 3 other vehicles, with repair costs ranging from $100 to $3,000.
Common Causes
Typical Repair Cost
Based on 8 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2442, 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 (6)
Secondary Air Injection System Failure (2UZ-FE)
Secondary Air Injection Pump Failure (3UR-FE/i-FORCE)
Secondary Air Injection Pump Failure (200 Series)
Secondary Air Injection Pump and Switching Valve Failure on 4.0L V6
Secondary Air Injection Pump/Valve Failure Triggering Limp Mode on 4.7L V8
Secondary Air Injection System Failure (100-Series, 4.7L V8)
FAQ
What does P2442 mean?
P2442 stands for "Secondary Air Injection System Switching Valve Stuck Open (Bank 2)." This is an emissions-system code, and it's the opposite condition of P2443. The secondary air injection system briefly pumps fresh air into the exhaust after a cold start so the catalytic converter warms up and cleans pollutants more quickly. P2442 means the switching (changeover) valve on Bank 2 — the cylinder bank that does not contain cylinder 1 — appears stuck in the open position, allowing air to flow when it shouldn't. The computer detects this through pressure/flow sensing or by seeing an oxygen-sensor reading that's leaner than expected when the air pump should be off. It's an emissions and inspection issue, not a drivability emergency.
What are the most common causes of P2442?
The most common causes of P2442 are: Switching/changeover valve stuck or sticking open (Bank 2), Carbon, debris or corrosion holding the valve open, Failed vacuum or electric solenoid controlling the valve, Vacuum hose leak, crack or wrong routing to the valve, Leaking or failed check/combination valve, Wiring or connector fault to the control solenoid. The specific cause varies by vehicle.
How much does it cost to fix P2442?
Repair costs for P2442 range from $100 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P2442?
Au7o has documented P2442 across 6 vehicle models from 3 manufacturers: Lexus, 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)
- TSBToyota Warranty Enhancement Program ZE3 for Secondary Air Injection System
- ForumTacomaWorld secondary air injection pump/valve failure thread
- videoYouTube - Secondary Air Injection Pump Replacement on 1998-2007 Toyota Land Cruiser by 4WD Mechanix
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.