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P0401 fault 1.4tdi Skoda Fabia possible faults?

Anthony123
in Skoda Fabia Mk2 (2007-2014)

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Hi All, have a Skoda 1.4tdi 2009 with fault code P0401. Workshop Exhaust appears and once whipped it comes back after a drive. Engine light comes on as well. I'm looking at possible faults to check/clean. I'm going to inspect EGR valve and clean, what else to check like sensors etc? No Dpf filter on this model. What sensors and other items can cause the fault. EGR valve was replaced 10k ago and car has been well maintained. Thanks in advance. 

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    Thanks a mill. This is perfect. Il go through everything just to double check as I'm working on the car. :) Cheers

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