which is usually replaced a little later. it will have to suck some from the battery (which is acting sort of like a capacitor). but occasionally with normal power surges etc. What's happening is your car with all its various modules can just barely run with the alternator output. This will confirm a charging system issue, that usually begins with a fading battery. And then magically be fixed when you re-start it.Ĭuriously, the battery light is usually dark (due to under-design of the charging system) but if this is the case (and I am quite sure it is). car will go into failsafe or other scary madness. just a second or two before you have the Christmas* tree on your dash. Most likely, you will see the voltage dip way down (in rare cases way up). is now)Īnd watch closely (leave it there while running and driving). (the car's running voltage will be displayed on your dash where the MPG or outside temp etc. Practice and do the on board voltage test. Suggested 1st course of attack: Google "E46 OBC hidden codes" I am pretty sure you will be shopping for a new battery soon.but you may get lucky like me, and find that it was only your engine ground cable loose (under the pass side of engine). The lights that would come on are things like the handbrake warning light, I think also the engine management light, the ABS or traction control light, and maybe another one or two things come on, and then go out. However, today, my girlfriend got about 10 minutes into her journey to work, and she's now broken down, after the usual warning lights on the dashboard flashing. Radio has switched off as well, and windscreen wiper performance reduced signigicantly, for a few seconds, and then self righted. However, since the wetter, colder weather has come in, the xmas tree light effect with the warning lights has become increasingly frequent. The car has been running fine all summer, though at one stage the amber engine management light came on, but before I could get it into the garage, the light went out a few days later.Īlso, before the summer, we used to have an intermittent problem where a few warning lights would flash on, and then go out a second or two later, after the car had been running for a while - say a quarter of a mile round the block.
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