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Problem for BMW 1999 318 ti

BMW E46 battery light and rev counter

By anthony_m396 on Jan 19, 2009

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i have a bmw318iSE e46 engine, the battery light comes on and the rev counter will jump sometimes just a little bit other times to 3k, i brought this car to a bmw dealership and they ran a diagnostic test on it and nothing showed up, i went to a few independent dealers and they told me its the alternator or the cam or crank shaft sensors so any help appreciated

Comments:

Mar 26, 2009

- There is no problem with the charging system ie the battery or the alternator, the problem is to do with the crank shaft sensor and it is common in the E46's

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Clarification Request

Posted by bossa_j on Mar 05, 2009

Hi, i got a 316i SE (reg in 2000). Same probelm as above. I cant start my car, rev counter jumps up and down hysterically. I took my car to garage, carried out ECU tests no faults found. then we decided to send the ECU unit to specialist to have alook at it yet again no problem found. I am not quite sure where to go from here. The car has been off the road for more than two weeks now (Feb 2009). Please advise

Same Problem

May 25, 2009

- My battery light went on when I was on the highway, pushing the bimmer tacking over 4 gran... the light has stayed on ever since.
The car starts fine and no other "electrical" problems with the radio, AC or locks.
As stated above, the crank sensor, seems the most logical.
Where is it located?- bigbobash

Feb 27, 2009

- Hi, i got a 316i SE (reg in 2000). Same probelm as above. I cant start my car, rev counter jumps up and down hysterically. I took my car to garage, carried out ECU tests no faults found. then we decided to send the ECU unit to specialist to have alook at it yet again no problem found. I am not quite sure where to go from here. The car has been off the road for more than two weeks now (Feb 2009). Please advise - bossa_j

Best Solution

posted on Jan 19, 2009

roedmondson

Rank: Wiz
Rating: 79%, 67 votes

oNCE THE BATTERY LIGHT COMES ON, IT MEANS THAT THERE IS A PROBLEM WITH UR CHARGING SYSTEM. mOST LIKELY THERE MIGHT BE A PROBLEM WITH UR ALTERNATOR. u SHOULD LIAISE WITH AN AUTO-ELECTRICIAN

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