Vacuum diagram needed p0171 code

SOURCE: 97 Jetta Secondary Air Injection System Incorrect Flow

the air pump is located on the engine towards the front of the vehicle and has apx. 3/4 diameter pipes running to and from it. it is apx. 2 fists in size and it is black plastic. one of the lines on top of the air pump runs to the other side of the engine towards the firewall. at the other end of that pipe is the valve. disconnect that pipe while the vehicle is running. no air out of the pipe means bad pump. air coming out of the pipe means bad valve

SOURCE: The check engine light has be checked several-P0411 error.

If were to venture a guess(and i am) it is either a valve or something that regulates either the rate of fresh air or the direction of it. Check the sec air valve or whatever VW calls it for blockage or sticking.

SOURCE: 2008 bettle secondary air injection sys incorrect flow

the air pump should start when car is cold, if you do not hear a small airplane under your hood, than it is not functioning, if you do, you'll need to do other diagnosis (checking vaccum lines most likely), but being such a new car, a dealer would probably be under warranty.

SOURCE: P0411 code 99 Passat

The secondary Air Injection system, this is basically an inspect and replace broken hose detail. Leave the inlet hose disconnected and start the engine. Listen and feel for exhaust hissing at the check valves.The check valve(s) will make like a gurgling sound as air is drawn in However , if exhaust is felt or heard replace the valve. Hope this works out for ya.

Marvin

• 85242 Answers
• Posted on Sep 03, 2010

SOURCE: my check engine lite is

More than likely the secondary air injection motor has failed, this is the case most of the time, check all the hoses and verify the connection's and if u find nothing openly wrong replace the secondary air injection pump assembly.