Niflheim Media Volkswagen Passat B5.5 2000-2005:Check Engine Light P0171

The check engine light went on again. Below is what our code reader (discussed in an earlier article)told us.


The evap purge valve was the easiest fix possibility after consulting the Internet. Links below


The valve is located under the air box cover. It is attached to the air box with a rubber grommet.


Turned out that’s what it was…the light went off right away by itself. Will check the codes later.


Here is a video about evap systems. Basically the gas fumes stay enclosed in the system instead of venting to the atmosphere. The valve we replaced controls the flow of the fumes from the evap canister to the engine. Topping your tank off makes crud go into the valve and clog it. Supposedly. This makes the engine run lean.


We used a wire cutter to cut the factory vacuum and evap lines. We used dorman clamps too.


We bought a Dorman valve from Carquest but I don’t like it since it came with a extra connector adapter. An original replacement Bosch from online would have been better….

System too lean bank 1

Evap purge valve?


Jason Thompson received his Bachelor of Arts degree in Law & Society from Winona State University where he studied U.S.-Mongolian Foreign Relations 1860-1920. He also attended programs at Hennepin Technical College in Minnesota, Soonchunhyang University in the Republic of Korea and at the University for Peace in Costa Rica. He has a Master of Arts degree from University of Nevada, Las Vegas where he focused on climate control and high-energy x-ray applications. Jason has wrote for Diesel Power and The Costa Rica News.

Contact us:

1(661) 802-9170

Support Niflheim Media:

About Niflheim Media:

Niflheim Media Places Your Idea, Product or Policy in the News:


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.