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A blocked DPF is a common symptom that occurs after or during a defect in the EGR valve.
I don't know why the Mechnaician replaced the pressure sensor and the turbocharger. Maybe he thought that a too low boost pressure was caused by the turbocharger.
However, it is often the case that too much soot gets into the DPF due to the defective EGR valve. This can no longer be burned and clog the DPF. Now the exhaust gas can no longer pass through fast enough and the exhaust gas flow is braked. This causes that the turbocharger which is driven by the exhaust gas flow does not bring enough pressure.
The DPF must be removed and sent to https://elitedpf.co.uk/ for cleaning. This company flushes out the filter with an industrial machine. You get your cleaned filter back. This is then just as good as an expensive exchange filter.
The problem should then be solved after resetting the training values for the DPF.
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