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This is a mk5 car so I'll move it to the mk5 forum. Is this the mk5 or mk4 body in Mexico in 2006?

The MAf could be causing this problem but also do a boost leak check. http://www.myturbodiesel.com/1000q_how_to/multi/boostleaks.htm Here is how to do it. A major boost leak is the car will jerk and buck back and forth. If you want to do a MAF check you'll need a VCDS cable and software from ross tech. Sometimes the MAF fails but does not throw a code.

Glow plug relay has nothing to do with power so that error code is nothing to do with it. It sounds like a bad ground or relay.
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