P0411 on Toyota
Secondary Air Injection System Incorrect Flow Detected
P0411 on Toyota vehicles indicates secondary air injection system incorrect flow detected. Au7o has documented this code across 2 Toyota models — most commonly on Sequoia, Tundra. This emissions code means the secondary air injection system is flowing an incorrect amount of air. That system pumps fresh air into the exhaust shortly after a cold start to help the catalytic converter heat up and burn off pollutants faster. The computer monitors the resulting change in exhaust oxygen readings, and sets this code when the measured airflow is too high, too low, or otherwise not what it commanded. It is primarily an emissions issue and often traces to the air pump, valves, or their plumbing. Typical repair costs on Toyota range from $100 to $4,000, depending on the specific model and root cause.
Common Causes of P0411
- •Failed secondary air injection pump
- •Stuck or faulty air switching/check valve
- •Carbon or moisture clogging the air passages
- •Leaking, cracked, or disconnected air hoses
- •Faulty pump relay or electrical wiring
- •Damaged or corroded connectors
- •Faulty vacuum control solenoid for the system
P0411 on Toyota by Model
Toyota Sequoia(2 issues)
- Secondary Air Injection System Failure (2UZ-FE)2001-2009
The 4.7L 2UZ-FE's secondary air injection system fails due to corroded air switching valves (ASVs) and seized air pumps. Moisture enters the system and corrodes internal components. Causes check engine light with P2440/P2442 codes.
- 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 Tundra(1 issue)
- Secondary Air Injection Pump Failure2005-2013
The secondary air injection pump is prone to failure due to water intrusion. The electric motor is located in the wheel well with moisture exposure, and the rubber boot covering the motor traps water, causing the pump to short circuit. This triggers check engine lights with codes P2440, P2443, P2445, P2447, P0418, or P0419. Some vehicles may enter limp mode.
Looking for P0411 on a different make?
View P0411 across all makes →Frequently Asked Questions
What does P0411 mean on Toyota?▼
P0411 stands for "Secondary Air Injection System Incorrect Flow Detected." This emissions code means the secondary air injection system is flowing an incorrect amount of air. That system pumps fresh air into the exhaust shortly after a cold start to help the catalytic converter heat up and burn off pollutants faster. The computer monitors the resulting change in exhaust oxygen readings, and sets this code when the measured airflow is too high, too low, or otherwise not what it commanded. It is primarily an emissions issue and often traces to the air pump, valves, or their plumbing. On Toyota specifically, this code is documented across 2 models.
What causes P0411 on Toyota vehicles?▼
Common causes on Toyota: Failed secondary air injection pump, Stuck or faulty air switching/check valve, Carbon or moisture clogging the air passages, Leaking, cracked, or disconnected air hoses, Faulty pump relay or electrical wiring. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0411 on a Toyota?▼
Repair costs on Toyota range from $100 to $4,000, depending on the specific model and root cause.
Which Toyota models have P0411 documented?▼
Au7o has documented P0411 on 2 Toyota models: Sequoia, Tundra.