Volvo Repair Questions? Ask a Mechanic for Answers ASAP
Hi, How are you?I'm Shabaz, one of the automotive experts. I will be happy to assist you today. Hopefully we can get this resolved quickly.
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There can be multiple causes for this fault, and a lot of technicians will overlook the EGR system, but I believe that the main cause is the EGR+hoses being full of carbon so, the EGR may operate correctly but the carbon build-up is causing the airflow inconsistency. Other causes can be the MAP/MAF sensor, split hose, or a loose air intake hose. A leak in the air intake after the turbo will create a hissing sound under acceleration, it sounds like using an air blower attachement for an air compressor.
Not a problem. It could be because of excessive exhaust back pressure, EGR issues can cause excessive soot build-up in the DPF, this increases regeneration cycles too, I have seen this happen in an Astra J 1.7cdti which was regenerating every 5 miles or so because of a sticking EGR valve. You could also try one of them DPF foam cleaners which you spray through one of the sensor ports in the DPF, they work ok when there is a little excessive soot build-up, not so well on heavy build-up though.
Cleaning the EGR+hoses and testing its operation via an OBD diagnostic tool is the best option at this point because the fault code relates to an inconsistent airflow, carbon build-up can cause this.
What is your engine size?
A DPF is shown on the parts catalogue for a 2.4D, it may have been introduced on a late 2005 model, if yours doesn't have it.
You can check for carbon build-up where the EGR pipe connects to the intake pipe, if there is carbon build-up there, then there'll be even worse build-up as you get closer to the EGR because the carbon build-up gets less and less as you go further away so, it's all clumping up close to the EGR.
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