P0411 on Volkswagen
Secondary Air Injection System Incorrect Flow Detected
P0411 on Volkswagen vehicles indicates secondary air injection system incorrect flow detected. Au7o has documented this code across 1 Volkswagen model — most commonly on Jetta. 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 Volkswagen range from $450 to $1,100, 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 Volkswagen by Model
Volkswagen Jetta(1 issue)
- Secondary Air Injection Pump and Combi Valve Failure (P0411) on the 2.5 Five-Cylinder2005-2014
The 2.5L five-cylinder Jetta (Mk5 2005-2010 and Mk6 2011-2014, engine codes BGP/BGQ/CBTA/CBUA) very commonly fails its secondary air injection system, which pumps air into the exhaust on cold start to light off the catalyst faster. The root cause is almost never the pump itself: the one-way combination valve (combi valve) between the pump and the exhaust fails and lets hot, moist exhaust gas back into the pump. That moisture corrodes the pump internals and, in winter, freezes - which is why many failures announce themselves on the first hard freeze, often blowing the pump fuse or burning out the J299 relay. The signature is a loud jet-engine or shop-vac roar for 60-90 seconds after a cold start, followed by a check engine light. The system only runs on cold start, so the car otherwise drives normally, but it is an emissions-test failure.
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What does P0411 mean on Volkswagen?▼
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 Volkswagen specifically, this code is documented across 1 model.
What causes P0411 on Volkswagen vehicles?▼
Common causes on Volkswagen: 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 Volkswagen?▼
Repair costs on Volkswagen range from $450 to $1,100, depending on the specific model and root cause.
Which Volkswagen models have P0411 documented?▼
Au7o has documented P0411 on 1 Volkswagen model: Jetta.