Cava 55Just to give you an update on my Limp home mode problem. The diagnostic check did not ID the real problem, it was just the first fault code and they decided to replace the part, with nil effect.
My problem was resolved when they checked the coolantflow and found it to be the water pump impella and after changing the pump & thermostat it has not occurred again.
In hind sight, if the garage had not relied on the computer diagnostic to do their thinking and I had given it to an old school mechanic, it would have been obvious with my symptoms. I think dealership technicians rely too heavily on computers these days instead of thinking about the symptoms/faults reported.
I'm a bit cheesed off it cost me over£800 to get the problem fixed. If anyone else has a limp home mode problem - check that your heater works when in limp home mode- if no or very little heat, it could be a pump or impella damage (which can be intermittent until it totally breaks).