Hi @ all! I changed the rear Lambda probe at the CAT at our Lupo (engine 1.0 MPi, engine code AUC). The error memory was deleted afterwards. Since then I have the following error, which occurs only in the cold state: – after pressing the ignition key the engine starts immediately – engine starts up about 1 s and goes out immediately – after 2nd pressing the ignition key it jumps again (somewhat heavier) – and then runs easily to 1200 u/min. – and when it gets warmer the rotation ahl auf ca. 700 u/min. – the whole does not occur when the engine is warm The petrol pump runs as always briefly, after opening the door. Tubes I have checked all. Throttle flap cleaned from above. Where should I continue with the troubleshooting? Are there known causes? Thank you!