RichTD

Many thanks for your expert advice, I will try that in the morning. Richard

Given that the turbo pressure is good when the engine is cold and low when it is up to temp might not infer that the turbo is on it's last legs, given a mileage of 143000?

C5 2003 110 HDI I managed to find a good Lexia system on ebay and have resolved many (not all) issues. Main problem is turbo boost pressure issues, when the engine is cold the turbo pressure can be so high as to cause the infamous "anti polution fault" However when hot the pressure is consistently low. While inspecting the pipes and intercooler for leaks I found oil in the air pipes coming from the turbo to the intercooler and from the intercooler to the manifold. There is no oil cooler associated with the intercooler as I think there are are on some versions. I suspect the oil is coming from the seals inside the turbo, and hence a new turbo will be needed. Please can anyone help..... Please...... Thanks. Richard