Hello, I’m new to the forum and drive an Alfa 147 2.0 Selespeed. Unfortunately it no longer runs properly. In the cylinders 3 and 4 there is no combustion. and the error memory says: P0300 combustion suspension; PO303 combustion cylinder 3; PO304 combustion cylinder 4; PO130 Lambdasonde ignition radio is there. Possible causes: – no fuel in the cylinders 3 and 4. (control unit defective or injection valves) – no compression (risk at the cylinder head or cylinder head dichung) I have ordered a compression pressure tester. I can check the compression in a few days. But how can I check the ECU or injectors? Are there other electronic components that control the injection? Thank you for your efforts.