Secondary air injection system

Asked by May 11, 2018 at 10:33 PM about the 2001 Audi A4 1.8T quattro Sedan AWD

Question type: Maintenance & Repair

I bought a 2001 Audi A4 Quattro 1.8l that had
modifications done to it which involved deleting
most of the secondary air injection system. The
check engine light stays on and I get the p0412
secondary air injection switching valve circuit A
code. How do I go about fixing it?

1 Answer

17,005

you could always jsut go to the dealer and ask them to print out a diagram for you. You can also get the haynes manuel. Anouther thing is find anotuher car like yours and look at it and how its setup. If the guy took it off and it runs fine tho i would jsut leave it. other wise if it bugs you find a junk yard and take out the parts your missing.

Your Answer:

Audi A4 Experts

  • #1
    Deathjam4
    Reputation
    5,660
  • #2
    lukeyramone
    Reputation
    780
  • #3
    James III
    Reputation
    560
View All

Related Models For Sale

Used BMW 3 Series
106 Great Deals out of 2,065 listings starting at $3,250
Used Audi A6
13 Great Deals out of 267 listings starting at $3,490
Used Audi S4
14 Great Deals out of 154 listings starting at $7,980
Used Mercedes-Benz C-Class
100 Great Deals out of 1,892 listings starting at $4,290
Used Audi A3
13 Great Deals out of 306 listings starting at $5,995
Used BMW 5 Series
39 Great Deals out of 697 listings starting at $3,995
Used Honda Accord
43 Great Deals out of 1,717 listings starting at $2,000
Used Volkswagen Jetta
101 Great Deals out of 3,913 listings starting at $1,895
Used Audi A8
62 listings starting at $7,495
Used Ford Mustang
31 Great Deals out of 1,575 listings starting at $3,999
Used Audi A4 Avant
34 listings starting at $4,900

Used Cars for Sale

2019 Audi A4 For Sale
103 listings starting at $47,948
2018 Audi A4 For Sale
8 Great Deals out of 108 listings starting at $29,494
2017 Audi A4 For Sale
7 Great Deals out of 74 listings starting at $24,875
2016 Audi A4 For Sale
30 listings starting at $20,450
2015 Audi A4 For Sale
8 Great Deals out of 109 listings starting at $16,888

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.