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Hi Guys,
Any help here would be appreciative. My 2012 nv200 keeps on getting p2002 (dpf efficiency below threshold) and p0299 (low boost). Had it in the garage who freed the waste gate as it was stuck, new glow plugs and needed 2 injectors changing and had the dpf force regend. Only been a couple of days and same 2 codes have flagged up.
What can I try myself before taking the van back for repairs? I’m quite handy but not a mechanic by any means.
I hear people mention on here about two sensors that go bad as a common problem? Any help please!
 

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There's a boost solenoid I've read of on here i think - also there's a pipe that runs to the dpf that can get blocked - running a bike brake cable down it attached to a drill has done the trick for some (I think, from memory, but don't quote me specifically for that P0299 code). If those answers weren't on here, might've been on the 'NV200 Owners Club' facebook group - get on there and do some scrolling
 
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