Hi. I have a 2003 E270CDI (W211) which has covered 120K miles with full dealer history until 112k. Intermittently it goes into limp mode, usually when cold but not always. When warmed up a stop and ingnition reset does the trick. However after driving on the motorways today it went into limp mode on a hot engine. Boost seems high sometimes before this fault occurs. I have cleaned the MAF but realise it may need replacing. No warning lights on and I have not had the codes read as I am not close to a non franchise expert. Any ideas greatly appreciated.