[Koalway Kid]

Has anyone had this happen to them when changing all four tyres or front wheel bearings:

Faults being displayed on I-Drive screen….

• Control System! Drive moderately
• Restraint System faulty!
• DBS Failure! Drive Moderately
• Flat Tyre Monitor failure!
• Start Assistant inactive!

Plus ABS, Stability Control and Active Steering have been deactivated.

For info…

Saturday I was booked in at my mates tyre shop to change my second set of Falken 452’s… as the ride comfort and wear had been outstanding compared to the Stock Bridgestone Potenza’s….

(This time I decided to fit 235/35/19’s compared to 225/35/19’s as they tend to offer the rim some more protection & you guys recommended them for this reason)

Plus I was getting a slight rumble from the front at high speed or under heavy breaking so I decided to bolt on new front bearing carriers (pattern parts but from BMW spares on line and looked identical)

It all went like clockwork Saturday morning until I was approx 1 mile from the tyre shop and the dash lit up like a Christmas tree with the above faults….

I pulled over to try to reset the tyre monitor as I’ve done in the past but I would not let me and suggested I contact the dealer…

I drove a little further and all the faults disappeared and I even checked for any fault messages… so I guessed the tyres were a little greasy and was playing tricks with the monitoring system and it had all settled down now…. But within another mile it had lit up again and I was feeling the ABS trying to kick in under gentle braking plus the car seamed to crab a little under braking (as if the brake balance was out).

I was now quite concerned by this time so I made it home and called out BMW Emergency Assist, as the car is still coved by warranty… The guy turned up within the hour and re-set the system, we took it out for a test drive but the faults appeared again within a mile or so… the corrective action being scanned was to replace both front wheel speed sensors… ? he said this was very unlikely for both to fail and would bet its sometime to do with the new tyres….

On close inspection he noticed the tyre size’s were different to the ones on the door pillar, so he said you may have to fit the correct size’s before he can refer me to the local BMW dealer… as he was unable to rectifying or recode the fault with his scanner?

Surely the car ‘s monitoring system can recalibrate to this slight change in tyres? Or is it that sensitive? and how have others got away with fitting this type & size of tyres?

For me to fit a full set of Run-Flat Bridgestone’s it would be close to £1300 compared to a full set of Non- Run Flat Falkens for £450?

I’ve spoken to the stealer today and they’ve offered to look at it tomorrow if I leave it with them all day…

Am I liable for a big bill for the dealer to investigate and possibly rectify…. because I’ve fitted pattern wheel bearings and non approved tyres? Any help would be appreciated….

[creepy coupe]

I hope you have made a mistake with the sizes you stated, should that be 265's rear?

[doughboy]

Are you sure your 'mate' has not damaged or disconnected any wheel speed sensors at the hub?

The errors you have seem related to wheel speed sensor failure, either 1 or both.

It definitely has nothing to do with tyre sizes, the reset function of the TPMS will correct for this for sure.

Get it back to your mates place, get the wheels off again and check the connections / sensor positioning.


Changing from RFTs is OK, but deviating from standard sizes can be risky as far as BMW (and you insurance) are concerned, you are now using 'non approved' sizes

[Koalway Kid]

Falken FK 452's: 235/35/19's front & 265/30/19's rear

[creepy coupe]

Originally Posted by Tony Morgan

Falken FK 452's: 235/35/19's front & 265/30/19's rear

So nothing like in your first post as DB said nothing wrong with the tyres I'm running the same.

[Koalway Kid]

Originally Posted by doughboy

Are you sure your 'mate' has not damaged or disconnected any wheel speed sensors at the hub?

The errors you have seem related to wheel speed sensor failure, either 1 or both.

It definitely has nothing to do with tyre sizes, the reset function of the TPMS will correct for this for sure.

Get it back to your mates place, get the wheels off again and check the connections / sensor positioning.


Changing from RFTs is OK, but deviating from standard sizes can be risky as far as BMW (and you insurance) are concerned, you are now using 'non approved' sizes

I inspected the sensors and took care not to damage or knock anything during the work... ? and periodically the fault clears?

[Koalway Kid]

Originally Posted by creepy coupe

So nothing like in your first post as DB said nothing wrong with the tyres I'm running the same.

Sorry it wasnt that clear in original post... I originally had Falken 225/35/19's on the front but they left the rim exposed to kerb knocks & i know that the Falkens are only avalibe in 265/30/19's for the rear. So this time i thought i'd try the 235's up front.

[creepy coupe]

I wonder if it would be worth diconnecting the battery for 5 mins, might reset the things which are unhappy.

[doughboy]

What about the sensor connectors or leads, any damage or loose connections?

[Koalway Kid]

Originally Posted by creepy coupe

I wonder if it would be worth diconnecting the battery for 5 mins, might reset the things which are unhappy.

Ive never tried disconnecting battery? is that safe?

[Koalway Kid]

Originally Posted by doughboy

What about the sensor connectors or leads, any damage or loose connections?

Im sure all sensors and connectors are un-disturbed... basically the wheel bearings asy bolts on with 4 bolts and the wheels and tyres are designed to be taken on and off?

[creepy coupe]

Originally Posted by Tony Morgan

Ive never tried disconnecting battery? is that safe?

AFAIK it will reset your cars trip and averages to zero and seat mirrors and so on stay with the key

[dxb335d]

What mileage you on now Tony?

WHy did you not go for the BMW parts!?

[Koalway Kid]

Originally Posted by dxb335d

What mileage you on now Tony?

WHy did you not go for the BMW parts!?

Just coming up to 50k...

BMW wheel bearings are £200 ea patern german parts are £80 ea....

[doughboy]

Originally Posted by Tony Morgan

Im sure all sensors and connectors are un-disturbed... basically the wheel bearings asy bolts on with 4 bolts and the wheels and tyres are designed to be taken on and off?

AFAIK the sensor 'markings' i.e. the moving slots or grooves that the sensor 'sees' are on the back side of the rotating bearing flange.

I think your non OE parts my have the wrong number, or wrong size of slots or they are somehow not visible to the sensor.

If they are not correct for your exact vin, or don't match the rear sets the car will get no reading or a different speed readings front and rear which are too great to come from tyre pressure differences.

I think you need get the wheels off and check / count the markings on you new bearings against the old ones you've taken off.

[creepy coupe]

Looking on RealOEM at part No5 if that the part DB was refering to. It doesn't show a different part from years 2006 to 2009

Unless the makers of the pattern parts have fecked up on their manufacture

http://www.realoem.com/bmw/showparts...66&hg=31&fg=10

[dxb335d]

£200 per corner for wheel bearings? WTF?!

[Koalway Kid]

Originally Posted by creepy coupe

Looking on RealOEM at part No5 if that the part DB was refering to. It doesn't show a different part from years 2006 to 2009

Unless the makers of the pattern parts have fecked up on their manufacture

http://www.realoem.com/bmw/showparts...66&hg=31&fg=10

The wheel bearing is a sealed unit so you cant see any mag pick up or notches.... I also checked the part on realoem to check they arent handed or year specific.... the only way i can check is to take off and fit again... and i dont really want to do that, unless i'm really sure?

[Koalway Kid]

Originally Posted by Tony Morgan

The wheel bearing is a sealed unit so you cant see any mag pick up or notches.... I also checked the part on realoem to check they arent handed or year specific.... the only way i can check is to take off and fit again... and i dont really want to do that, unless i'm really sure?

http://www.bmwpartsonline.co.uk/prod...t=&prod_id=270

[milesr3]

Did you keep the old bearings?

One way of knowing if the bearing unit is the cause of the problem would be to swap the original units back in again. I'd be surprised if your original bearings were really worn out after only 50K as well. Are you sure the noises you were hearing are not just caused by the tyres? I know that my Falken ZE912s are silent, unless you are breaking when they do make a lot more noise.

[milesr3]

Originally Posted by creepy coupe

Unless the makers of the pattern parts have fecked up on their manufacture

Are they pattern parts or the OEM supplier to BMW for these?

[Koalway Kid]

Originally Posted by milesr3

Did you keep the old bearings?

One way of knowing if the bearing unit is the cause of the problem would be to swap the original units back in again. I'd be surprised if your original bearings were really worn out after only 50K as well. Are you sure the noises you were hearing are not just caused by the tyres? I know that my Falken ZE912s are silent, unless you are breaking when they do make a lot more noise.

I did keep the bearings and one of them was tight to turn + I'm a trackday regular and I do the Nurburgring once or twice a year... so they have had some stick... the car is quiet now....