I have only recently purchased an E46 330i Touring.
I have had a few problems to sort out over the last couple of weeks, but this morning the car wouldn't start. The dash lights come on, it tries to turn over but sounds very very sluggish. I tried to jump start it from another battery using the underbonnet connections and that didn't make any difference. then I tried from another car with the engine running but I could only connect to the battery terminals in the boot as the car was behind me in the drive. This didn't work either. I would of thought It would jump start from another car. Unless I had poor connections I am at a loss. If the battery has died completely is it possible that could cause the inability to jump start it. The only electrical work I have done on the car is to replace the outside temperature sensor yesterday, which involved soldering the wires back together as someone had either cut them or it had been ripped off. The display was reading correct outside temp yesterday after I had done it. i haven't had a chance to test the battery voltage etc. yet as i had to abandon the car this morning to get to work. The central locking was very sluggish to lock so it looks like a flat battery. Any advice appreciated.
I love BMW's but after two weeks of problems since purchase I am beginning to think what have i let myself into.
Sorry for the length of text, but the more info you have the more you may be able to help.