Code light and injector light on constantly

Evening gents

To cut a long story semi short was driving home yesterday the coupe felt as if it cut out whilst driving revs dropped and then picked up again pulled over and it cut out started again fine so drove home turned it off whilst sorting my wheels but left boot and door open I thought the battery had died as it would not start after this bought a new battery today put it on and still won't fire and I have the code light and injector light on constantly any ideas as to where I can start

Thanks Chris

Update

All fuel related relays no longer click constantly
Rad fans cut in with ignition on then the top yellow relay clicks and they cut out
Attempts to run but then continues to turn over
Plugs are wet so I'm getting fuel
After turning ignition on last night there was a loud pop/bang from the rear right hand side of the car

I'm really stumped on this so any help would much appreciated