Hello, I have a Coupe model year 2004 and have taken over from an Astra G OPC2 (unfortunately too rotten to save) the engine with mechanics. In the OPC2 the Z20LEH engine with LET wire harness was already installed. The OPC2 is model year 2003 with cable harness B6D and in the interior full equipment (air conditioning automatic, xenon…) . As said motor compartment and motor harness was taken over up to the X2 plug. My Coupe has no climate automatic and no rain sensor, halogen headlight etc. I also took over nrücklaufleitung with pump ( original was a Y piece on the fuel filter which I put blind and moved the return line forward from there). During the first start attempt he unfortunately did not jump on, engine turned but did not jump on. I then read that the immobiliser at model year 2001+2 may not be wired properly, then I transferred a throw line from the control unit A17 (“Ringantenne” Pin 2 to the MSG PIN 13 with the same negative has someone an idea that might not be right? I’m at the moment baffled and a bit overburdened. I’d be happy to help you in RLP on site.