DTC 4011

Asked by ed280z Sep 07, 2008 at 04:43 PM about the 1997 Volkswagen Jetta Trek

Question type: Maintenance & Repair

I have 97 trek and the DTC code is 4011 I have replaced the front O2 sensor, the secondary air pump and the egr and it still reads that I have secondary air injection problems (Incorrect flow) can anyone help, and does anyone have a vacuum line schematic for a trek

1 Answer
6,885

Daniel answered 15 years ago

Make sure the air pump works. The air pump takes air from the intake and puts it into the exhaust, to "reduce" emissions. Check the fuses/relays, electrical connections, and air tubing. A vacuum diagram won't help you. Unplug the pump, and use two jumper wires from the battery to give the pump power and a ground to see if it works. Also, get a test light and connect it to the + and - terminals in the air pump connector on the harness, and have someone turn the key on, without starting the motor. The test light should light up for a moment. If not, there is a problem with the power (ie fuse, relay, or signal from ECM) or ground. You can also use the test light to check each side of the circuit.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

Shortcuts

Search Volkswagen Jetta Questions

CarGurus Experts

  • #1
    Deathjam4
    Reputation
    12,380
  • #2
    Goodwrench707
    Reputation
    5,400
  • #3
    Ed92626
    Reputation
    4,630
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Volkswagen Passat
24 Great Deals out of 503 listings starting at $3,499
Used Honda Civic
191 Great Deals out of 4,038 listings starting at $440
Used Toyota Camry
50 Great Deals out of 1,123 listings starting at $784
Used Toyota Corolla
130 Great Deals out of 2,282 listings starting at $103
Used Honda Accord
47 Great Deals out of 973 listings starting at $2,995
Used Volkswagen Golf
41 Great Deals out of 517 listings starting at $4,880
Used Volkswagen Golf GTI
16 Great Deals out of 532 listings starting at $1,704
Used BMW 3 Series
59 Great Deals out of 1,213 listings starting at $2,500
Used Hyundai Elantra
155 Great Deals out of 3,034 listings starting at $1,995
Used Nissan Altima
25 Great Deals out of 677 listings starting at $3,795
Used Nissan Sentra
63 Great Deals out of 1,918 listings starting at $3,900

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.