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
6,935

Daniel answered 16 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.

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