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vwnewton, VW Owner,ASE Master and L1 Advanced
Category: VW
Satisfied Customers: 307
Experience:  25 years of VW obsession turned into a job, last 15 years as a VW Tech.
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I own a B6 passat (2007) and both the epc and check engine

Customer Question

Hi, I own a B6 passat (2007) and both the epc and check engine lights are on, when this happens, It takes a lot of effort to accelerate. Sometimes after I restart the vehicle, indicators go back to normal as well as acceleration.
Submitted: 1 year ago.
Category: VW
Expert:  Wolfgang replied 1 year ago.

Thanks for choosing Just Answer . I'm Wolfgang here to help!!
Below is my first answer or request for more information. If you do not understand it, or you need more information from me, or need me to go in more detail. Do not rate yet, just reply. Put yourself in my shoes, I can not see, smell, hear, feel or touch your car, nor do I know any history on it. So take into consideration I am doing my best based on what you tell me. Also understand fixing cars often requires sophisticated tools, that you may not own. So even if you can not do what is outlined in my answer, that does not mean my answer is wrong deserving to be rated negative.

did you have scan test performed to see what faults are stored?

please let me know

Customer: replied 1 year ago.
I took my car to a vw dealership, and they say they need to replace the throttle body, control unit and repair throttle lines. They want to charge 5K usd for this repair.
Expert:  Wolfgang replied 1 year ago.

WOW!!! can you get the codes that were stored? the throttle lines means wiring?

can you provide a vin of the vehicle please . i do believe that there is a technical bulletin that may apply for this issue but i do need the above information


Customer: replied 1 year ago.
the lines mean wiring. I went to get my car today but I was not able to obtain the codes.
The vin number is:
Expert:  Wolfgang replied 1 year ago.

can you double check the vin # ***** comes up invalid


Customer: replied 1 year ago.
Sorry, he it goes: WVWEU73C77P019736
Expert:  Wolfgang replied 1 year ago.

sorry for the delay!!

there is a technical bulletin if it has these 2 codes

01 07 67 Oct. 26, 2007(###) ###-####/p>

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Vehicle Information


EPC Warning Light On and/or Throttle Body DTC P0121 / P0221 Stored in ECM Fault Memory Electronic Power Control (EPC) and/or Malfunction Indicator Lamp (MIL) warning lamp(s) illuminated with DTCs set.

Technical Background

Routing of engine electrical harness too loose, producing intermittent connection at Throttle Position (TP) Sensor -G79-/Accelerator Pedal Position Sensor 2 -G185- connector.

Typical DTCs set:

^ 00289 / P0121, Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance

^ 00545 / P0221, Throttle/Pedal Position Sensor/Switch "B" Circuit Range/Performance

Production Solution

Revised engine wiring harness routing around the throttle valve control module and improved throttle valve beginning with VIN:

^ 3C_7E115305

^ 3C_7P087974


In case of a malfunction, check wiring harness routing around throttle valve control module. If necessary, replace all pins in 6-pin connector on throttle valve control module as follows:

Remove air filter to expose wiring harness around throttle body control module. Verify that the harness requires modification. Harness routing around throttle body control module as shown in illustration A -below- will require modification.

Wires with yellow insulation internal to conduit are an indication that harness has already been modified.

Modification Procedure

Remove and discard the following components:

^ Corrugated tube T-connector -1-.

^ Corrugated tube -2-.

^ Electrical tape -3-.

^ Disconnect connector and remove all terminals with terminal removal tool VAS1978/7.

Assemble and install six jumper wires.

^ Install six wires using Part No:###-##-####.

^ Seal terminals with yellow terminal seal Part No: 3B0972742B.

^ Tape the six wires and remaining harness wires together - 1- using 5 cm (2 in.). of electrical tape Part No:###-##-####

^ Shorten wires by approximately 4 cm (1.5 in.) and arrange them/mark them so that one wire leads to each pin.

^ Shortest wire should lead to pin 1 and longest wire should lead to pin 6.

^ Connect individual wires using splice connectors Part No:###-##-####.

Use crimping tool VAS1978/1-1.

^ Secure wires -1- using electrical tape Part No:###-##-####

^ Reconnect original corrugated tube -2-.

^ Install a new corrugated tube -3- Part No: N90773501.

Ensure that the corrugated tube overlaps both ends of exposed harness.

^ Install protective cap -4- Part No:###-##-####

^ Install new T-connector Part No: N90669501 on corrugated tube.

Make sure that ends of corrugated tubes overlap in T-connector and are locked tight.

^ Install clip Part No: 4A0820199 at locations -1- and -2- above