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What is scanner code PO411 - 1999 Volkswagen Cabrio

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Code po411 secondary air injection system incorrect flow,possible causes , faulty air pump or faulty air pump vacuum valve or faulty check valve.

Posted on Apr 06, 2011

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Secondary air injection system incorrect flow

Posted on Apr 06, 2011

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That code means that you have a, secondry air injection system ,incorrect flow detected

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Po411


This is a code related to the air flow from the air pump (aka pollution pump) into your exhaust system. This air pump takes outside air and injects it in the exhaust stream after the engine to help burn off any residual fuel or pollutants. When P0411 comes up, the control module detects a lack of air flow either caused by a defective air pump, leaking/clogged air hoses, or bad check valves.

Sep 17, 2009 | 2000 Cadillac Catera

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Diagnostic code po411


The P0410 code refers to the emissions system.
The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.
About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.

In here you can find the Trouble Codes List:
The CODE mean P0411 Secondary Air Injection System Incorrect Flow Detected

Good luck!!!

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1997 Ford SHO has check engine light on..PO411..


i would go to autozone if it is for egr valve then it is actually the dpf sensor the other codes are straight forward they will check them for free

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