Due to the joints on the intercooler being pressed and not welded. In turn causing an indifference in pressure and causing the turbo seals to fail.Not disputing the boost sensor pal. Hence the oil collecting can
intercooler joints were just crimped onto an o ring, same as most are using now, when they started failing the cost of a new one was about £300, we got a percentage of that as a handling charge from warranty, when they realised how many we were changing in warranty the price dropped to about the £50 mark, then they looked into why they were failing and found out about the overboost