Question about 2002 Volkswagen Golf

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2002 VW Polo - EPC Light and Loss of Power

2002 VW Polo - Experiencing continually issues with the EPC light. VW garage explained it was wiring fault with the pedal and paid for repair with no resolution to issue. Secondly we took to a local mechanic and they replaced the map sensor. The vehicle weekly looses power and the epc comes on? It has become extremely unreliable car. Any advice would be appreciated greatly.

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Hi,
It is a wiring fault, but they are looking on the wrong end. You will need to have a VW dealer "repin" the electrical connector at the throttle body. What this means is, the dealer will take apart the connector, cut off the old pins and crimp on new ones and reassemble the connector. This is a common problem on drive by wire VW's. The dealer has a bulletin on the problem and I don't know why they missed it. They will probably have to order the connector kit however. Good luck!

Posted on Sep 11, 2010

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Epc light on


EPC means Electronic Power Control.

When this light comes on, yopu could have such a sudden power loss.

However, before visiting a workshop for help, do the following basic checks:

No air leak into the intake system.

Ensure that all the electrical socket in the engine management system are well fitted, no loose contacts.

This light can be caused throttle valve malfunction, MAF, brake lights, EVAP , 02 sensor, secondary air pump.

I suggest you visit a competent dealer or independent shop for help. They will scan the EPC and run 'Throttle Body Adaption'. and diagnos the problem. Ask for a garage with a 'Ross Tech VAG-COM' or a ' VW diagnostics scanner.'

See here for a shop near you : http://www.iatn.net/shopfinder/

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The best way to determine the problem is to get the trouble codes read.
The most common issues are the brake switch (actually on your brake pedal) and the MAF (Mass Airflow Sensor). Since you're experiencing a loss of power I would definitely go with the MAF.
If you were having trouble shifting out of park (if you have an auto) I would say brake switch (this switch has been recalled by vw 2x).

Getting the fault codes read would definitely narrow it down, but I'm betting on the MAF.
Please rate/vote! Thanks!

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My Polo had a similar problem and the brake light switch at the brake pedal was replaced. Then the computer was reset and the EPC light issue was resolved. It has something to do with the engine management, when sensing the light switsh being activated, retarding the power of the engine.

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