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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 12-19-2012, 05:33 PM   #1
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Apparently I need a new ECU...

My dash recently lit up like a Christmas tree:
DSC, Handbrake, ABS, Tire pressure monitor, SMG cog.

I took it to my indie, and he said the error was with a rear wheel sensor, unfortunately he replaced it, tested all the other sensors as fine, and yet the problem persists. His conclusion: I need a new ECU (~1000?).
He wants to get an electrics expert to check, but he's not available till the new year, so I am hoping to do some research in the mean-time.

Has anyone else experienced this, knows how likely it is, or of any alternatives?

Thanks in advance,

2002 Euro E46 M3
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Old 12-19-2012, 07:46 PM   #2
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I would definitely get a second opinion from another shop. Definitely check traction control and DSC modules. The WSS is the usual problem. The SAS less so.... but possible.

Last edited by Alan; 12-19-2012 at 07:48 PM.
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Old 12-22-2012, 08:00 AM   #3
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If you do end up needing a new ECU, look into getting it repaired / remanufactured. I'm sure there are some other companies in the U.K. But here is some info on one in the states
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Old 12-22-2012, 08:24 AM   #4
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I diagnsed a bad ECU for a shop using INPA. Shipped itto an ECU shop in British Columbia (canada)

They took it apart and traced it to a short on the O2 sensor circuit. Someone shorted it pulling the engine out.

The ECU's are tough. I doubt it is your problem. You can't replace an ECU without having it coded to the car (the ews and light control if I remember correctly.

I would bring your car to someone who specializes in BMW's and has the diagnostic tools.
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Old 12-22-2012, 11:59 PM   #5
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Check your steering angle sensor.
In order to finish FIRST, you MUST first FINISH !

Joy is future proof
Get your "M" on . . .
Reading is FundaM3ntal

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Old 12-23-2012, 11:07 PM   #6
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Originally Posted by turbo_f22_pilot View Post
Check your steering angle sensor.
This. You don't need an ECU. When was your last alignment? Have the car hooked up to INPA or GT1 and get the codes. They will show.
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Old 12-26-2012, 04:26 PM   #7
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Thanks guys for the responses, I will definately check out the steering angle sensor.
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Old 01-10-2013, 10:41 AM   #8
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Thanks for all the responses guys, fortunately it turned out to just be a wiring fault near the wheel speed sensor. A fair old whack spent on labour, but at least I didn't need a new ECU!!!!
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