The ‘Service vehicle soon’ message is showing on my 2014 Vauxhall Insignia 2.0 CDTI ECOFLEX 163 automatic. The EGR valve has been replaced, but the message is still appearing. When it does, I lose power and there’s no acceleration when I put my foot down. Peter Mullaney
I am assuming that the vehicle service schedule is up to date and oil changes have been performed as required and that the service indicator has been reset. If this is the case, the problem could be any number of powertrain-related issues. The best course of action would be to read the fault codes to get a more accurate picture of the problem.
One of the more likely causes is a split or crack in one of the induction hoses to or from the turbo or intercooler. This would give the symptoms you describe and can be difficult to trace. Check the pipes carefully and look for any sign of oil seeping out.
Another possibility is that the mass air flow (MAF) sensor is faulty. Cleaning it with either a dedicated cleaning spray or isopropyl alcohol may help, but do not touch the hot wire element of the sensor and ensure it is fully dry before attempting to start the engine.
There is also the possibility that the problem is occurring due to a blocked diesel particulate filter. This may need a forced regeneration, but if the codes are read it should clarify the situation.