De la Rosa has been dropped after only managing to score six points so far this season . Heidfeld joins Sauber for the rest of the 2001-03 Formula One season . Heidfeld replaces Nick Heidfeld , who is 'surprised ' by the decision . Heidfeld began season as test driver for Pirelli before joining Mercedes .
Heidfeld joins Sauber for the rest of the 2001-03 Formula One season . Heidfeld replaces Nick Heidfeld , who is 'surprised ' by the decision . Heidfeld began season as test driver for Pirelli before joining Mercedes .