Hi Guys, can anyone shed any light on the problems I'm having with my 2003 4200 cc. I've recently replaced all four lambda sensors on my car, since which time it's ceased to run properly. The sensors by the way are Bosche from Lambda Power of Sheffield with the correct part numbers. When cold it starts ok but once it's warmed up it's very reluctant to start. It fires then stops or it fires and runs but the RPM fluctuates for a few seconds and then it just dies. If I "catch it " when it fires it can be persuaded to run but it's far from happy. Once it's on the move it drives ok . Has anyone any thoughts on this, does it need to be hooked up to an SD2 machine? Or have I gone and ruined it?