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Epc light comes on some times with loss of power

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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!

Posted on Jul 18, 2009

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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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I have codes po 638, 121, 221 does all these mean that i need a throttle body, also epc light comes on . with pwer loss , turn car back on you have power at first with all codes but i n a short time light...


I believe it's all related to youe brake light switch. There is a recall on it. It sticks and causes the epc kight to flash, also causing your other stated issues. If recall working has been done, buy the dealer switch. It's easy to replace.

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