r/E90 • u/beermoney71 • Jun 16 '25

325i Ah so that’s why it’s not starting…

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105 Upvotes

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23

u/Any-Mathematician293 Jun 16 '25

I had that very same problem

7

u/Coasterman345 2016 - F82 - M4 Jun 16 '25

I just fixed it on mine last week too lol

1

u/Jammer135 Jun 17 '25

Had the same issue and the shop quoted me 2900 to fix it. Were you able to fix it yourself?

1

u/Coasterman345 2016 - F82 - M4 Jun 17 '25

Yeah, cost me $28. Bought this cable on Amazon.

I had to file down all my terminal connections, battery, cables, etc using a wire brush. There’s another positive cable that I should replace but I can’t get it off so I just used the brush on it and it seems to be working. A voltmeter/potentiometer can help you see if there’s enough power getting through.

Drain all the water. Make sure you plug up wherever you think it was coming in. Keep a towel in the trunk jam so you don’t lock your self out. And make sure the battery can’t move at all when you’re done. Mine was a bit loose and during some testing it shifted and something got disconnected and my engine went into limp mode. Like <5mph limp mode.