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Old 29-07-2011   #1
Join Date: Jun 2010
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Czech Republic 
P1206 dpf issue

hey guys.
getting p1206 - clean or replace particulate filter on my 120k 2007 1.9 doblo so after some research ive checked MAP sensor which was very sooty, EGR was sooty too so i replaced both but none of those things solved the problem.Strange thing was that DPF obstruction was only 40%. so next thing ive done was disconnecting the maf then cleared the fault. after that
car was running ok, dpf regenerated when the obstruction hit about 80% so i thought faulty MAF so i fitted new MAF(bosch) but the same problem was still there - 40% obstruction -> P1206 -> unplug MAF -> clear fault -> everything OK.
Then i started notice the car was smokin under hard acceleration wheter the MAF connected or not and poorer MPG so ive checked IC and all pipes for splits, nothing found everything was dry and clean. so i decided to check injector correction rates and inj no. 1 & 4 was about +/- 1.9 and 2 & 3 was +/- 0.6 on idle.then i took it for a spin and the correction rates
of 1 and 4 went to +/- 5.6 mm3/i. 2 and 3 stayed pretty much the same. is that mean the injectors are worn and this could be the possible cause of the P1206 error? somebody told me the inj. correction values shouldnt go over +/- 0.9 mm3/i no matter if on idle or under the load. any suggestions?
many thanks
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