😧  hi I’m new go forums and Audi’s as well I’ve got a s3 2003 model bam 225 I bought as a project All the front end was removed and all the wiring unplugged to get ready for the engine to be removed. That’s how I bought it. I removed the engine and fitted a set of forged Conrods then reinstalled the engine wired up what I need to fire the engine   It I can’t get any spark or injectors to open there’s no engine speed on diagnostic test but it’s not showing crank sensor fault. I fitted a new Bosch crank sensor but still the same  there’s a plug with four bl k weed on in front of the starter motor I can’t find a home for   Please can anyone help?

Don't forget it could be an imobiliser issue. What lights up on the dash when you go to start it? 

All the usual lights come on the key light comes on and goes off so I presume it’s reading the key.