The engine water temperature gauge reads higher than normal, this could be because the DPF is partially blocked and is restricting the hot exhaust gases from escaping. In extreme cases, an engine may initially start but then stall, or even not start at all this could be due to a severely blocked DPF. Until recently, it was normal practice for common rail diesel fuel injection specialists like CRD Performance and even some general repair garages to completely remove these troublesome filters. A smoke emissions test will still however be carried out.
