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

3,065

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

Add photo

Search Volkswagen Jetta Questions

Volkswagen Jetta Experts

#1 FordNut
FordNut
Reputation 2,120
#2 Goodwrench707
Goodwrench707
Reputation 2,000
#3 Deathjam4
Deathjam4
Reputation 1,320
View All

Related Models For Sale

Used Volkswagen Passat
257 Great Deals out of 21,439 listings starting at $1,700
Used Volkswagen GTI
153 Great Deals out of 6,318 listings starting at $2,299
Used Honda Civic
1,173 Great Deals out of 67,654 listings starting at $1,500
Used Volkswagen Golf
35 Great Deals out of 3,013 listings starting at $1,700
Used Honda Accord
1,264 Great Deals out of 78,832 listings starting at $969
Used BMW 3 Series
1,833 Great Deals out of 41,344 listings starting at $1,250
Used Toyota Corolla
1,417 Great Deals out of 69,993 listings starting at $988
Used Toyota Camry
1,525 Great Deals out of 101,602 listings starting at $700
Used Audi A4
375 Great Deals out of 13,440 listings starting at $1,599
Used Nissan Altima
1,350 Great Deals out of 86,045 listings starting at $695
Used Volkswagen Beetle
256 Great Deals out of 8,783 listings starting at $1,957
Used Ford Focus
1,301 Great Deals out of 60,647 listings starting at $1,295

Used Cars For Sale

2017 Volkswagen Jetta For Sale
11,933 listings starting at $11,679
2016 Volkswagen Jetta For Sale
36 Great Deals out of 1,588 listings starting at $10,278
2015 Volkswagen Jetta For Sale
140 Great Deals out of 3,880 listings starting at $8,037
2014 Volkswagen Jetta For Sale
163 Great Deals out of 3,184 listings starting at $5,977
2013 Volkswagen Jetta For Sale
195 Great Deals out of 3,052 listings starting at $4,995