[Bobbych]

I was driving the other day using cruise control as I usually do on motorways and I went down an incline. The car seems to struggle to downshift correctly and at one shift I felt a jolt and immediately three lights came on.

I had Abs, traction and general exclamation warning.

On the media screen it warned me the DSC was off and to drive carefully. It also turned of TPMS

I pulled over and switched off the car, waited and restarted. All lights came on. I drove off and they then went out.

The rest of the journey was fine

I connected carly and the only fault was (SPEED WHEEL 0xCE)

It didn't show any other faults

Any ideas what caused this?

I have been getting also random wheel spins whilst accelerating slowly with the DSC light flashing for a second at the same time.

[N5GKP]

Quite possibly a wheel speed sensor on its way out, mine does it and Carly points to the OSF wheel speed sensor - I'll replace it eventually 😅

[Bobbych]

Thanks. But carly is not showing me which one is faulty just the one code I said above

[therealdb1]

The fault code should tell you which wheel it is.
Have you got a watered down version of Carly as the general consensus on here is that Carly is very good?
The alternative is to see if there is anyone local to you (location of UK does not help on a UK forum!) who can scan the car for you with a different reader like INPA to find out that way.

Word of advice though, when you do decide to replace the offending sensor buy a genuine BMW one. These cars do not like cheaper copies which usually cause more problems than they are worth.

[Bobbych]

Thanks. As far as I know I purchased the full carly

I drove again yesterday and I got the traction control light twice came on, both times as I went over bumps in the road at motorway speeds. Light flickered on and off bth times.

As for carly this is the dump file and as you see at the top it only shows wheel speed error.

Is 0x49f2 telling me?

Faultcode: (0x49F2) Message (SPEED WHEEL 0xCE)
Faultset 1:
(appeared at: 143376.0km)
Exhaust gas pressure upstream of particle filter:
1045.91 hPa
Exhaust gas temperature before catalytic converter - corrected value:
184.71 degC
shut-down:
287.00 s
Current gear:
6.00 -
Battery voltage of IBS measured:
14.80 V
Injection quantity - quantity setpoint without compensation scheme:
0.00 mg/hub
Recorded battery voltage:
14600.00 mV
vehicle speed:
102.00 km/h
Fuel temperature:
36.00 degC
Kuehlmitteltemperatur (sensor value before correction):
87.00 degC
Boost pressure - Actual:
1129.41 hPa
Boost pressure plate - output duty:
83.92 %
Air mass per cylinder:
445.49 mg/hub
Air temperature HFM - from sensor characteristic:
19.00 degC
Air temperature after Intercooler:
18.00 degC
Engine speed:
1948.00 rpm
Status word signal error CAN:
1.00 -
ambient pressure:
985.88 hPa
Unused environmental condition:
255.00 -
Default generator target voltage (output value):
14.90 V
current time in the current system status:
3434.00 s
current motor status:
16.00 -
filtered accelerator sensor signal:
0.00 %
maximum rail pressure of the last 10ms:
698.04 bar

[therealdb1]

Mmm! That's a tricky one!

49f2 is telling you that it is being confused by the vehicle speed sensing.

If it were a simple ABS wheel sensor it should indicate which one but since you do not have that code it may take a bit more detective work.

Initially, because it costs nothing except your time, I would suggest looking at each of the wheel sensors in turn checking that the connections are good, unplug them and plug them back in under the wheel arches ensuring that there is no corrosion, and that the wiring insulation is intact and not shorting out on parts of the suspension. Also while you are in there check the reluctor rings are not badly contaminated or cracked.

It sounds to be an intermittent fault which briefly occurs to trigger the code and then disappears when you look for it. These are the worst sort!

Try the above and let us know what you find.

[Bobbych]

I'm going to ask the obvious question. Is it just the rear drive wheels that have sensors or all 4

[therealdb1]

Nope! There is a sensor on each wheel.
If they were on the rear only ABS would not work on the front brakes because it would not know that a front wheel had locked.

If you don't know about the site already go to www.realoem.com and enter the last 7 digits of your chassis number. This will give you exploded views of the parts on your car together with BMW part numbers which is very useful when ordering spares.

[Bobbych]

Thanks. I just remember reading that part of the system was an Abs ring on the drive shafts but assumed with no such shafts on the front how it works

[therealdb1]

There is still a ring on the front wheels but it is inside the hub on the back of the bearing.
You could do a quick check on these, if Carly lets you view the sensor outputs in real time, by jacking up one front wheel and spinning it while you look at the sensor output.
You should get continuous pulses at a frequency proportional to the speed at which you spin the wheel.
You can do the same for the rear, of course, but you might have to lift both rear wheels simultaneously especially if you have a limited slip diff.

[Bobbych]

Update.

Had the rear drivers sensor replaced by indy who said it had an intermittent fault. Was ok for a few days then came back. Seems to be worse in wet or cold weather. I changed the sensor myself for another and again the fault cleared for a few days. But now its back on. Codes say rear drivers speed sesnsor. Its not the senskr and the indy checked my reluctor rings and said they are fine. Any ideas

[Silver Streek]

Dodgy connection where you are plugging the new sensor into the wiring of the car in the wheel arch.. maybe. Worth a check.

[Bobbych]

That's what I thought I'm going to have a look at it. When I connected it I must admit the wires that came out of the car connector looked a bit suspect

[Silver Streek]

Its the most likely candidate. Try and trace the wires back to the next junction box up and then buzz them out as someone wiggles the joint. Any dodgy connection will soon become apparent.

[Bobbych]

I am bringing this back up as my issue returned

last year I had this issue and the Sequence is always the same

driving along,then

1 - judder with flashing TC light
2- few mintues later DSC Fail light with associated lights
3 - Tyre Pressure loss light


after leaving car off for around 10 minutes this would reset and drive normally


Last year my local garage replaced

Both Rear ABS Sensors, TWICE
Offside rear drive shaft (ABS ring assumed corroded due to code showing RH Rear fault)

This seemed to clear it

However


this year again, its back. Same issues, but code showing LH Rear

One thing I have noticed, this only happens in either DAMP or WET conditions. If I have left the car overnight, and it has either rained or been a damp morning I get the issue, so this is clearly now moisture realted

the other day I was driving and I only got the Tyre press loss warning, nothing else, but the tyres were fine

This seems to me, to be Wiring/Electrical which does not like damp

so my question

does the ABS/TPW use the same module, so is the module getting damp?

if not, where is the moisture most likely getting into the system?

[rasa bmw]

have you checked sensor to see if its getting worn down?by reluctor ring if it is

[Bobbych]

The sensors are not work and have no marks on them

[Daviebrown]

Any free play in the rear wheel bearings can change the gap between the reluctor ring and the sensor causing the system to detect a wheel locking up, check for free play with the wheel up and handbrake off.

[Bobbych]

so again, one year on, and same issue, and it always seems to be in Colder, Wetter conditions (autumn/winter)

in the last 18 months, I have changed BOTH Drive Shafts, and Both Sensers. All was good, until this week

Again, I am getting ABS/DSC/TPW warnings above 20mph.

Fault codes are

005DC1 - Speed Sensor Rear Right
005DC3 - Speed Sensor Rear Right

0049F2 - Speed Wheel 0xCE


so it Cant be the Drive Shafts rusting, so it looks like another Sensor failed. But I am starting to think it is Water Ingress as it always happens in winter


However, onto my actual question

When it Says REAR RIGHT

can anyone confirm, which side is this on a UK based car, Near or Far side? (passenger or Driver)

or is RIGHT determined from when you are sitting it the car?

I just want to make sure I replace the correct sesnsor

[Tambohamilton]

The left/right is as if you're sitting driving the car; right is UK driver/off side.

Good luck with the rest of it. I bet you have a wiring issue somewhere away from the sensors themselves.