Hi guys,


I've had a reoccurring fault code that keeps coming back after 20 miles. P0401 which says egr insufficient flow. I've removed the EGR valve to see if it was stuck, it was partially gunked up but I've seen worse. I cleaned it any how and cleared the code. It's back


I've checked the vacuum pipe from the valve to the main vacuum block and no splits. I've heard it could be the MAF, the cooler, the valve itself and I've even heard someone mention the turbo. I have vcds so if anyone requires any readings to help me out I would be very grateful.


Thanks.