4 DASHBOARD LIGHTS ALL AT THE SAME TIME

[Ivesy]

Hi everyone. Wandered if anyone had any thoughts on this, I'm hoping it's not the ABS pump as I had this on my E93 and it was expensive. All of a sudden I've got an ABS light, Brake light, Tyre Pressure light, and Traction Control light...
I've heard mention of possible battery problems but the car is reading 14.5v when running and the battery is not that old. I have noticed recently I'm getting some white noise from the speakers when the stereo is off. Could it be some kind of electric issue caused by damp?
I'm referring to an E85 3.0si.
Any advice gratefully received. Thanks. Tom.
P.s. Engine light was already on, dodgy maf sensor.

 

[enuff_zed]

All four are usually a wheel speed sensor.
If the speedo works its not the rear left.
Get a decent code reader on it and it should tell you which one.

 

[Ivesy]

Thanks very much for that mate. Is it an awkward job or can a diyer get it? I've done quite a few bits myself on other bmws.

 

[enuff_zed]

Thanks very much for that mate. Is it an awkward job or can a diyer get it? I've done quite a few bits myself on other bmws.

Pretty easy.
You need to find out which sensor first as the cables azre different lengths.
Then it's wheel off bolt out, pull the sensor out of the hub, disconnect it from the junction box on the inner wing and fit the new one.
Only slight issue can be the bolt holding it in place. Allen key head which is made of cheese and very easy to round off, so soak it with plusgas or similar for a while beforehand and make sure you have a perfect fitting allen key.
If you don't have a code reader, maybe say where you are and see if anyone is close enough to help out.

 

[Ivesy]

Appreciate that bro. I'm Surrey. Near Guildford. I have a couple of code readers so will give them both a go and see what comes up. I have to go to the mechanic for the Maf sensor because it's too awkward for me to get to so worst case I'll ask him to do a quick scan. But I'm always interested to meet local Zed heads. Must be some specialists around Surrey. I'm fairly new to the area. Thanks again.

 

[pvr]

All four are usually a wheel speed sensor.
If the speedo works its not the rear left.
Get a decent code reader on it and it should tell you which one.

You sure it is not rear right? When my left front sensor went, the code reader stated either left front or rear right, so bought both. It was the left front that was done, so I still have the rear right spare.

 

[enuff_zed]

Technically the lights could be on any of the four wheels, but the rear left signals the Speedo as well, so if that’s working it rules it out.

 

[pvr]

I didn’t know every wheel had a sensor attached

 

[enuff_zed]

I didn’t know every wheel had a sensor attached

Their primary job is to report back any discrepancy in the rotational speed of the wheel to allow the Traction Control/Dynamic Stability and ABS gubbins to do their thing. So one is needed on every wheel.
They also use any change in rotational speed to detect a change in rolling radius of a tyre and therefore flag that it is losing pressure.
I don't think everyone understands that the tyre pressure system on an E85 has no idea what pressure is in any tyre. It merely takes note of the rolling radius of each tyre and waits to see if any change significanlty from the rest. So you could put completely different pressures in each of the four tyres and when you recalibrate it will take those as the datum and report any changes.

 

[Ivesy]

I didn’t know every wheel had a sensor attached

Their primary job is to report back any discrepancy in the rotational speed of the wheel to allow the Traction Control/Dynamic Stability and ABS gubbins to do their thing. So one is needed on every wheel.
They also use any change in rotational speed to detect a change in rolling radius of a tyre and therefore flag that it is losing pressure.
I don't think everyone understands that the tyre pressure system on an E85 has no idea what pressure is in any tyre. It merely takes note of the rolling radius of each tyre and waits to see if any change significanlty from the rest. So you could put completely different pressures in each of the four tyres and when you recalibrate it will take those as the datum and report any changes.

Thanks Zed. Speedo is fine but REV counter has an intermittent fault, could that be related? It seems to work when it wants to, sometimes kind of works but not properly, and other times just does nothing at all. Its a E86 btw, not an E85 as I said earlier... dunno if that makes any difference.

 

[j3nks79]

Just plug in a code reader.
Just all guess work without

 

[Ivesy]

Just plug in a code reader.
Just all guess work without

Great thanks