I am the original owner of a 2005 R53 hardtop and now having difficulty with a P0128 issue. The cooling system and all its components are in good working order except it is taking a long time to warm up and then there is rapid cool down when driving.

Its not the thermostat as I have experimented with three and tested them all and been hyper aware of the installation procedure. By the way there are no O.E.M.thermostats because there is a factory back order here and in Germany so I am using one of the aftermarket units suggested by the dealer.

The professional shop I use says there is a 2006 bulletin recalling the R53 for a Reflash of the DME module to help relax some of the stringent parameters however, I can find no such bulletin and was wondering if any of you know about it ?

Even if it exists, what could it possibly improve ? It cannot change the time on my stop watch and the temperature readings of my scan tool. When its 15 C outside and it takes the engine 24 minutes to reach thermostat opening temperature of 91 C, there is nothing a new program can do to change that. There are ways to turn off the engine light and maybe have the DME Module ignore the settings for P0128 however, that still leaves the engine with a warm up problem, not to mention poor emissions and fuel efficiency, etc.

If there are any MINI Techs on this forum or users with first hand experience with p0128 and the DME Reflash, please let us know.
Thank you