My C3 Is Playing Up Won't Start!

[Lynetteallen69]

Hi

I'm new to this so please bear with me.my c3 has been playing up for the past few weeks.it started with the engine management light that came on and an oil leak.my husband fixed the leak but the light is still on.we have replaced the gearbox ecu today and the accelerator as the diagnosis codes were saying it was a throttle position sensor then ecu.after doing that my hubby tried to start her but she wouldn't start.we read up how to reset ecu but that hasn't worked.shes got a minus sign on her and snowflake and now a flashing battery light.my battery has never had a problem and in fact my car has never been a problem till now.pulling my hair out as we cannot seem to fix her problem or can't start her and nearest Citroen garage is in basingstoke! Charging up battery overnight now as I type this but any help or suggestions is greatly appreciated as I need the car thank u