DTC 4011

Asked by 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

3,815

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.

Your Answer

Volkswagen Jetta Experts

  • #1
    Goodwrench707
    Reputation
    2,480
  • #2
    Deathjam4
    Reputation
    1,970
  • #3
    Tom Demyan
    Reputation
    1,490
View All

Related Models For Sale

Used Volkswagen Passat
496 Great Deals out of 24,750 listings starting at $1,200
Used Honda Civic
705 Great Deals out of 65,174 listings starting at $999
Used Volkswagen GTI
136 Great Deals out of 7,029 listings starting at $1,700
Used Honda Accord
1,107 Great Deals out of 66,541 listings starting at $561
Used Volkswagen Golf
114 Great Deals out of 4,215 listings starting at $1,500
Used Toyota Camry
959 Great Deals out of 91,207 listings starting at $300
Used Toyota Corolla
895 Great Deals out of 60,571 listings starting at $850
Used BMW 3 Series
1,081 Great Deals out of 33,881 listings starting at $1,000
Used Audi A4
302 Great Deals out of 12,272 listings starting at $1,899
Used Nissan Altima
1,102 Great Deals out of 79,270 listings starting at $1,500
Used Volkswagen Beetle
205 Great Deals out of 8,617 listings starting at $1,500

Used Cars For Sale

2017 Volkswagen Jetta For Sale
68 Great Deals out of 10,489 listings starting at $10,000
2016 Volkswagen Jetta For Sale
82 Great Deals out of 1,984 listings starting at $7,777
2015 Volkswagen Jetta For Sale
144 Great Deals out of 3,008 listings starting at $6,990
2014 Volkswagen Jetta For Sale
203 Great Deals out of 4,058 listings starting at $4,995
2013 Volkswagen Jetta For Sale
56 Great Deals out of 1,307 listings starting at $4,700

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.