Hi has anyone else had this problem I get error code p0407 07E8pd generic ,gas recirculation sensor B low I have cleaned egr, pdf changed egr sensor and am still getting this code I am in limp mode with engine management light on and glow plug light flashing.When I accelerate as soon as I get to 2000 revs limp mode kicks in I am at a total loss now can anyone suggest a cure please I have an a3 8p 1.6 tdi 2010 with 90,000 on clock