My girlfriend's R52 has had battery problems and no power issue, but it's all taken care of now. The problem is that it won't start and the lights go on and off even when the car is off. It's coming up with OBD2 codes P303 and P0313. The car recently ran out of gas, but has over half a tank now. I've checked all the fuses and relays even under the fuse box in the engine, battery is brand new and the cables to the battery are all good. Fuel pump and pressure is good. I'm going to check the spark plugs and ignition coil next. Is there anything else I can check? Why are the lights flashing on and off? Thank you for any help you can provide.