UPDATE 1-German car regulator widens emissions probe to 23 brands

* KBA says has third-party indication of irregularities * Transport minister has said more checks underway * 50 models made by European, U.S, Asian producers affected (Adds list of companies affected, transport minister) By Ludwig Burger FRANKFURT, Nov 11 (Reuters) - Germany's motor vehicle regulator will run tests on more than 50 models of 23 German and foreign car brands on suspicion of further manipulation of nitrogen oxides emissions from diesel engines, it said on Wednesda