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The BMW Range
5 Series
m20 ecu reset?
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<blockquote data-quote="ehoe" data-source="post: 48783" data-attributes="member: 141"><p>So for those that have this ECU losing its setting problem, how do you go about changing your battery assuming its due for a change?. </p><p></p><p>1) Use jumper cables to connect the existing battery to the new battery then only removing the old battery. This will avoid power lose and thus no lose of ECU settings.</p><p></p><p>or</p><p></p><p>2) Start the car and let it run then remove the old battery and replace with a new battery. By starting the car, the power is supplied by the alternator whilst the battery is replaced. </p><p></p><p>Are there any implications on using any of the above two methods?. i.e it won't fry any of the electronics or damage the alternator, etc??. </p><p></p><p>Anyone got a better way to go about it?.</p></blockquote><p></p>
[QUOTE="ehoe, post: 48783, member: 141"] So for those that have this ECU losing its setting problem, how do you go about changing your battery assuming its due for a change?. 1) Use jumper cables to connect the existing battery to the new battery then only removing the old battery. This will avoid power lose and thus no lose of ECU settings. or 2) Start the car and let it run then remove the old battery and replace with a new battery. By starting the car, the power is supplied by the alternator whilst the battery is replaced. Are there any implications on using any of the above two methods?. i.e it won't fry any of the electronics or damage the alternator, etc??. Anyone got a better way to go about it?. [/QUOTE]
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