New Owner Old Problems - 123d

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RobMorris
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New Owner Old Problems - 123d

Post by RobMorris » Thu Aug 16, 2018 4:24 pm

Hi all

New Owner here of a 2008 123d with existing problems.

I bought it as spares/repairs. I'm not a qualified mechanic but handy with a spanner and I can use Google/Forums/YouTube etc.

Anyway my 'new' car has absolutely now power; it feels like it has only 50bhp - I am assuming (hoping) it is in Limp Mode. Otherwise its driving alright.

The DTC light is on constant amber and believe its this fact that is resulting in the Limp Mode?

I plugged in my eBay reader and it says there are no faults to read?

So now I am gathering intel of where to start first.
1. Could be ABS sensor / Reluctor ring / Driveshaft fault
2. ABS Pump fault
3. DSC Control Unit fault

Anything else I can check?

Thanks Rob

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Re: New Owner Old Problems - 123d

Post by marco_polo » Thu Aug 16, 2018 4:31 pm

I'd check the 3 turbo actuators (8, 9 & 10) for starters:

Image

Air filter and fuel filter are worth crossing off your check-list too.

No funny noises? Boost leaks? EGR and DPF clean and clear?
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Re: New Owner Old Problems - 123d

Post by RobMorris » Fri Aug 17, 2018 10:22 am

Thank you

I shall add these to the list.

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Re: New Owner Old Problems - 123d

Post by RobMorris » Sat Aug 18, 2018 8:38 am

Using the onboard diagnostics through the stalk - I am receiving the following CCID codes

24
35
71

Investigation continues

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Re: New Owner Old Problems - 123d

Post by marco_polo » Sat Aug 18, 2018 8:57 am

71 is just the rear brake wear sensor, iirc. Replace and reset, and it should clear.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Re: New Owner Old Problems - 123d

Post by RobMorris » Sat Aug 18, 2018 11:47 am

marco_polo wrote:
Sat Aug 18, 2018 8:57 am
71 is just the rear brake wear sensor, iirc. Replace and reset, and it should clear.
Thank you sir - The rear pads and discs were only replaced 2 months ago and on inspection today still look brand new. Perhaps it just needs a reset or the wear sensor was not replaced at the same time / faulty.

--

Further fault finding / check list

Additional to the permanant DSC light on (Amber) (Sorry not the DTC light as I mentioned at first)
I also noticed the handbrake light is on permanant (Red) - Even when driving / Handbrake off.

I checked the brake fluid level and reads MAX.

I have then removed the rear wheels and checked the ABS/Speed sensors. Both sides look good but I do have a question..
Should all cars (Incl my 2008 E81 123d) have reluctor rings on the drive shafts?
With sensors out - I can look through to the shaft but I see no relector ring 'teeth'. I see just a rusty 'smoothish' shaft as I turn the wheel.
Could both sides have corroded so much they have perished?

Regards Rob

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Re: New Owner Old Problems - 123d

Post by marco_polo » Sat Aug 18, 2018 11:54 am

The brake warning light could just be the rear wear sensor. What does the mileage say on the rear brake CBS? --.-- ?

Not all reluctors are the same design, the better ones are built into the rear wheel bearings.
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Re: New Owner Old Problems - 123d

Post by mikesmith2939 » Sat Aug 18, 2018 12:03 pm

It may be worth investing in a BMW specific code reader rather than a generic one as some are not able to read all the modules.

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Re: New Owner Old Problems - 123d

Post by RobMorris » Sat Aug 18, 2018 12:35 pm

mikesmith2939 wrote:
Sat Aug 18, 2018 12:03 pm
It may be worth investing in a BMW specific code reader rather than a generic one as some are not able to read all the modules.
Ive bit the bullet and have a 'proper mechanic' (mobile) on his way with a real diagnostics machine. My cheapy eBay rig found nothing so fingers crossed.

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Re: New Owner Old Problems - 123d

Post by RobMorris » Sat Aug 18, 2018 2:49 pm

The real codes -

4C12 - Message: (STAT_DSC, 0x19E), signals in message not valid
4A74 - Glow system, communication
4A79 - Glow system, communication
5E24 - Hydraulic unit, pressure sensor; plausibility
5E20 - Hydraulic unit, pressure sensor, internal fault
5DE1 - Brake pad wear, plausibility, rear axle

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Re: New Owner Old Problems - 123d

Post by marco_polo » Sat Aug 18, 2018 3:45 pm

Steering angle sensor, glow plug issue, DSC Hydro unit sensor, and a rear brake sensor.

None of that should cause a 50bhp Limp mode though.
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Re: New Owner Old Problems - 123d

Post by RobMorris » Sun Aug 19, 2018 3:00 pm

marco_polo wrote:
Sat Aug 18, 2018 3:45 pm
Steering angle sensor
Thanks @marco_polo
Can I assume code 4C12 refers to the steering angle sensor?

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Re: New Owner Old Problems - 123d

Post by marco_polo » Sun Aug 19, 2018 3:06 pm

I suspect so, hopefully it just needs recalibrating. Is your battery healthy and fully charged? If not, that can cause electrical gremlins including SAS issues.
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Re: New Owner Old Problems - 123d

Post by RobMorris » Sun Aug 19, 2018 4:46 pm

marco_polo wrote:
Sun Aug 19, 2018 3:06 pm
I suspect so, hopefully it just needs recalibrating. Is your battery healthy and fully charged? If not, that can cause electrical gremlins including SAS issues.
Battery is good. Stop/start works which I think is a good indication.
I believe the calibration is turning the steering wheel full lock left to right over and over? I have done this but nothing has changed with the dash lights and I cant keep calling out the 'Diagnostics man' at £50 a time to check.

I have bought the following and hopefully I can do it myself? - https://www.ebay.co.uk/itm/BMW-USB-OBD- ... 2749.l2649

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Re: New Owner Old Problems - 123d

Post by marco_polo » Sun Aug 19, 2018 4:59 pm

I don't know of anyone who's successfully reset their SAS with the DIY Left/Right procedure.
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