P2443 on Toyota
Secondary Air Injection System Switching Valve Stuck Closed (Bank 2)
P2443 on Toyota vehicles indicates secondary air injection system switching valve stuck closed (bank 2). Au7o has documented this code across 3 Toyota models — most commonly on Land Cruiser, Sequoia, Tacoma. 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. Typical repair costs on Toyota range from $300 to $3,000, depending on the specific model and root cause.
Common Causes of P2443
- •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
P2443 on Toyota by Model
Toyota Land Cruiser(2 issues)
- Secondary Air Injection Pump Failure (200 Series)2008-2021
The secondary air injection system on the 200 Series Land Cruiser (3UR-FE and later engines) fails due to moisture intrusion and corrosion of the air switching valves and pump motor. The system pumps air into the exhaust manifold during cold starts to reduce emissions. When it fails, it triggers check engine lights and can prevent the vehicle from passing emissions testing.
- Secondary Air Injection System Failure (100-Series, 4.7L V8)1998-2007
The secondary air injection (AI) system on the 100-series Land Cruiser (1998-2007) with the 2UZ-FE 4.7L V8 is a notorious failure point, identical to the issue on the Sequoia and Tundra of the same era. The electric AI pump, air switching valves (ASV), and exhaust manifold check valves all fail. The aluminum check valves in the exhaust manifolds corrode and seize, the ASV sticks from carbon buildup, and the pump motor eventually burns out. This system is responsible for the most common check engine light on 100-series Land Cruisers.
Toyota Sequoia(1 issue)
- Secondary Air Injection Pump Failure (3UR-FE/i-FORCE)2008-2019
2nd-gen Sequoias with the 5.7L 3UR-FE also suffer from secondary air injection pump failures, similar to the 1st gen but with updated part numbers. The pump seizes from internal moisture corrosion, triggering P2440-P2445 codes and check engine light.
Toyota Tacoma(1 issue)
- Secondary Air Injection Pump and Switching Valve Failure on 4.0L V62005-2011
Tacomas with the 1GR-FE 4.0L V6 are known for failures of the secondary air injection system, including the air pump and switching valves. Moisture intrusion and valve sticking can trigger check-engine lights and force the truck into reduced-power or limp mode. Owners frequently report sudden loss of acceleration along with expensive dealer repair estimates because the intake manifold often must be removed to access components.
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View P2443 across all makes →Frequently Asked Questions
What does P2443 mean on Toyota?▼
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. On Toyota specifically, this code is documented across 3 models.
What causes P2443 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2443 on a Toyota?▼
Repair costs on Toyota range from $300 to $3,000, depending on the specific model and root cause.
Which Toyota models have P2443 documented?▼
Au7o has documented P2443 on 3 Toyota models: Land Cruiser, Sequoia, Tacoma.