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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 07-01-2013, 05:21 PM   #1
Mikem6
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Join Date: Jul 2013
Location: California
Posts: 5
My Ride: E46 m3
Battery, alternator, fuel pump?

I have an 02 m3 with a recent battery light lit up and codes p0175 and p0157

For the battery light I had it on a couple months ago took out the alternator tested it at autozone and it tested perfectly fine, so I changed the voltage regulator and that fixed my problem, recently it lit up again and died on me at an intersection with less then 1/4 gas as I heard fuel pumps cause that to happen when less then 1/4 gas..
I was wondering if this has anything to die with my fuel pump because I have all symptoms for that issue.. It died on me a couple days ago 20 min from my house took out the battery tested it was fine.. Put it back in and got home safely with no problems.. Light still lit. My voltage is also 12.3 on and 12.0 off which seems to low but as I said my alternator is fine.. Is it my voltage regulator again or? (Changed that about 2k miles ago)? I need help

And for my codes I'm thinking its an 02 sensor or fuel pump, no leaks , cleaned maf, so I'm hoping its that..

If anyone can help with some insight that would be awesome, thank you.
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Old 07-01-2013, 05:23 PM   #2
Moosecakes
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My Ride: 02' SMG M3
your 2 codes I believe are are o2 sensors, I have the p0175 right now, secondary bank, secondary o2.

Have you changed your battery yet? I think mine has a dead cell and is causing low voltage issues. Because my car runs just fine.. Not sure on your fuel pump issue, but the filters are pretty cheap and a clogged one can cause issues like you described.
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Old 07-01-2013, 05:39 PM   #3
Mikem6
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Quote:
Originally Posted by Moosecakes View Post
your 2 codes I believe are are o2 sensors, I have the p0175 right now, secondary bank, secondary o2.

Have you changed your battery yet? I think mine has a dead cell and is causing low voltage issues. Because my car runs just fine.. Not sure on your fuel pump issue, but the filters are pretty cheap and a clogged one can cause issues like you described.
Nope I haven't yet.. I might try that? And do you mean the fuel filter? Should I go towards that before the pump?
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Old 07-01-2013, 05:53 PM   #4
Moosecakes
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Yea I would replace the filter before the pump, that's spendy. Just get a MANN filter, OE manufacture

You wont be able to test for a dead cell unfortunately, but if you have another battery on hand that you know is good then try swapping it in. I need to buy a new battery still..
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Old 07-01-2013, 11:29 PM   #5
Mikem6
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Originally Posted by Moosecakes View Post
Yea I would replace the filter before the pump, that's spendy. Just get a MANN filter, OE manufacture

You wont be able to test for a dead cell unfortunately, but if you have another battery on hand that you know is good then try swapping it in. I need to buy a new battery still..
Thanks for the help, I'll let you know how it goes once I do all that
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Old 07-01-2013, 11:56 PM   #6
Grinchxvx
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Battery, alternator, fuel pump?

If you have extra cash just buy a new fuel pump assembly and the fuel sender unit. But the fuel sender unit is what would be causing you to run out of gas early.


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