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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jun-09-2009, 02:02:48 PM   #1
sosheal
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Default DSC Pressure Sensor replacement

Like several others, I'm experiencing an intermittent yellow BRAKE light and DSC light (no ABS light) malfunction. Codes repeatedly are 5e16 (CAN instrument timeout) and 5e20 (DSC pressure sensor 1, electrical failure). So, I figure replacement of the sensor is in order.

For those who have replaced this sensor or done work on the master cylinder, is this a job for a moderately competent DIYer? Once the plastic partition that separates the area of the master cylinder from the engine bay is removed, is there room to get to the sensor and remove it (car is 6MT)? Does the brake fluid reservoir need to be emptied prior to removal of the sensor? Does the hydraulic system need to be bled after the sensor is replaced? Is sensor 1 the front one on the master cylinder? Any hints, tips, or experience to share? Anything that should be done before replacing the sensor?

Thanks.
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Old Sat, Jul-11-2009, 03:00:18 PM   #2
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Any luck with this? Did replacing the pressure sensor get rid of the problem?
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Old Wed, Jan-26-2011, 08:15:23 AM   #3
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Default Re: DSC Pressure Sensor replacement

Sosheal......do you have an update on this?

I got a DSC light today and GT1 (on VM laptop) indicated DSC pressure sensor 2.

Would be nice to be able to fix it myself....with some advice?

Marty
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Old Sat, Dec-28-2013, 05:55:02 AM   #4
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Default Re: DSC Pressure Sensor replacement



Any tips? Would it be easier to remove the DME or remove the brake fluid reservoir to access the BPS/DSC sensor. TIA
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Old Sat, Dec-28-2013, 12:38:02 PM   #5
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Default Re: DSC Pressure Sensor replacement

Pressure Sensor #1 is for the front (V or Vor) hydraulic circuit, and should be marked with a '25' next to it (in both MK60 and non-MK60 vehicles). Pressure Sensors #2 is for the rear (H or Hinter) hydraulic circuit and should be marked with a '20' next to it on the older non-MK60 vehicles (<09/2002) and a '22' next to it for MK60-equipped vehicles.

You will most certainly need to bleed your brakes thereafter. In theory, you could just bleed one leg of one hydraulic circuit, but you'll also have to do an ABS bleed since you'll be forcing any potential bubble all the way through it as well. That being said, I wouldn't take the chance, just bleed the whole thing and be sure it's done right.

I've seen it done another way where bleeding wasn't required, but I'm not going to detail it as it was a total hack and I found myself surprised it worked as well as it did.
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Old Sat, Dec-28-2013, 01:28:20 PM   #6
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Default Re: DSC Pressure Sensor replacement

Quote:
Originally Posted by p0lar View Post
Pressure Sensor #1 is for the front (V or Vor) hydraulic circuit, and should be marked with a '25' next to it (in both MK60 and non-MK60 vehicles). Pressure Sensors #2 is for the rear (H or Hinter) hydraulic circuit and should be marked with a '20' next to it on the older non-MK60 vehicles (<09/2002) and a '22' next to it for MK60-equipped vehicles.

You will most certainly need to bleed your brakes thereafter. In theory, you could just bleed one leg of one hydraulic circuit, but you'll also have to do an ABS bleed since you'll be forcing any potential bubble all the way through it as well. That being said, I wouldn't take the chance, just bleed the whole thing and be sure it's done right.

I've seen it done another way where bleeding wasn't required, but I'm not going to detail it as it was a total hack and I found myself surprised it worked as well as it did.
Thanks for the advice. I'll for sure bleed the whole hydraulic system: brakes and clutch. I was just inquiring for tips accessing these DSC sensors. Just a quick glance, it looks buried in there like an Alabama tick. I believe I found a solution, however. Thanks again

Sent from MI6
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Old Sat, Dec-28-2013, 06:11:27 PM   #7
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Default Re: DSC Pressure Sensor replacement

You will want an open ended wrench for the sensor, fluid will come out when you take sensor out so make sure to have lots of shop towels shoved down in the compartment.

100% have to bleed system post doing this and run the abs sensor flush as well or it'll cause you problems

Took me 3 or so hours to do, all of it was prep work to make sure brake fluid didn't bit anything and that was worth doing
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Old Mon, May-12-2014, 06:14:34 PM   #8
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Default Re: DSC Pressure Sensor replacement

Trouble in paradise!!!
I found this thread via searching and i'm bring it back.
My 04 Vert has been experiencing this a few times. The lights have come and gone. However, its back and its been ON for the past 3 days.
I stopped at a local indy and got the same codes as the OP.
Any DIY or pics? Also whats the cost at the dealership?
Im Bump out about this, I hate lights on my instrument cluster/

Should i start by cleaning out the abs wheel sensors first? The car has 26K on the clock, garaged kept and brake fluid flushed every 2 yrs.

Thanks
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Old Mon, May-12-2014, 10:36:41 PM   #9
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Default Re: DSC Pressure Sensor replacement



asking for some help....
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Old Fri, Mar-25-2016, 07:24:48 PM   #10
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Default Re: DSC Pressure Sensor replacement

I am also having this issue, so reviving this thread. Does anyone have advice?
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Discussing DSC Pressure Sensor replacement in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)