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lack of power on 2003 Volkswagen Jetta TDI

lack of power

Asked by for the 2003 Volkswagen Jetta TDI
ALSO POSS PLUGGED CATT OR RESTRICTED EXH SYSTEM OR AIR FLOW SENSOR.REC COMPLETE DIAG AS NOT TO GUESS
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Could be anything from a EGR to a simple fuel filter. EGR is common on that vintage.