wheel change now have warning lights! Z4 e85 2003

[Olliebeak]

Today I changed the wheels on my 2003 Z4 e85 2.5 from 16" to 17" with new tyres. I now have three warning lights on the dash, the tyres are not run flat and dont have pressure sensors. The 16" wheels taken off were just ordinary wheels as well.
I cannot see the reason for this does anyone have any ideas? I already have a problem with an airbag light and dont need any more!
Any thoughts appreciated.

 

[gookah]

it has seen a different rolling circumference from the new setup, and thinks tyre pressure is wrong somewhere.
That's how the system works, on circumference of the wheels and revolutions compared to other wheels, and not actual pressure.
press and hold the tyre reset button with just ignition on (not engine running) until it turns yellow from red,. then turn off ignition and back on, that should clear it
This will set the new setup as the default again.

 

[Olliebeak]

Thanks a lot for you reply, where do I find the tyre reset button?

 

[t-tony]

Thanks a lot for you reply, where do I find the tyre reset button?

It's on the row of switches above the ash tray.

Tony.

 

[Olliebeak]

Tried your reset suggestion above, when I pressed the reset button the warning light on the dash came on yellow not red, and when I started the engine the other warning lights remained on. I went for a short drive and the lights went out(great) however this was short lived and they came back on again. I stopped the car and again pressed and held the button, the lights went out again when I drove off but came back on within half a mile.
Any further suggestions , perhaps I am not holding the button down long enough?
If I put the original 16" wheels back on will the fault clear?

Thanks again for the advice, I hate these electrical issues!

 

[Nodzed]

Today I changed the wheels on my 2003 Z4 e85 2.5 from 16" to 17" with new tyres. I now have three warning lights on the dash, the tyres are not run flat and dont have pressure sensors. The 16" wheels taken off were just ordinary wheels as well.
I cannot see the reason for this does anyone have any ideas? I already have a problem with an airbag light and dont need any more!
Any thoughts appreciated.

Airbag light could possibly be your battery. (has it got flat recently?) There is a firing pin on the positive terminal (in case of accidents) if this gets a low wattage signal it fires up the AB light (don't ask why as I have no idea) on mine it even coded the AB sensor in the rear passenger pillar as faulty, a quick visit to my local BMW Motorsport Indy who had come across this before they told me to go get a new battery and fit it, did that problem went away. There was nothing wrong with any of the 4 AB sensors.

 

[Nodzed]

TMPS dont hold the button in for more than 10 seconds

 

[gookah]

Check the tyres are the same width and profile on each axle. is there a spacer left on one, but not the other?

are the pressure the same across each axle?
do you have a red tyre light on the dashboard?
if so, turn just the ignition lights on (engine not running), press and hold the tyre button until the red light turns yellow.....
then turn off the ignition, and back on that should clear the tyre light.

What other lights are showing? other than the airbag?

If you were to swap the wheels back again and the fault disappears you have an issue with the new wheels. is one buckled? try spinning each one whilst car is jacked up in the air?

 

[Nodzed]

Wheel speed FTM which your vehicle will have as this system is fitted to most 2003/ 2006 Z4s, tyre pressure is monitored by ABS wheel speed sensors. The ABS / DSC control module compares rotation speeds at all four wheels. In case of pressure loss in a tyre, the rolling radius and therefore rotation speed of the wheel changes in relation to the other wheels. The inflation difference is decided indirectly through tyre speed difference. The control system detects this difference and turns on the warning light on the dash. So it could be a ABS sensor thats causing the initial problem. Its possible a sensor / wiring could have been disturbed / damaged during the tyre change What other lights are coming on your dash, maybe post a photo??

 

[Olliebeak]

Thanks for all your comments and suggestions,
I bought the wheels secondhand, they have just been refurbished and fitted with virtually new Falken tyres, they dont appear to be damaged or buckled etc.
The tyre light on the dash is yellow and goes out when the button depressed, it is never red.
The other lights on are ,abs,handbrake, and one other
I did hold the button down for more than 10 secs.will try holding it down for a shorter time
When I fitted the wheels and checked the tyre pressures they were at 3bar, I reduced them to 2.1 bar as per sticker on door post.
When I was fitting the n/s rear wheel I jacked the car up in the wrong place and broke through some plastic just in front of the nsr wheel, I dont suppost there is a sensor of some sort behind there which I may have damaged.

If I dont have any success the old wheels are going back on!

Anyone want to buy newly refurubished wheels in anthracite (grey/blue/) with virtually new Falken all season tyres!!?

 

[Olliebeak]

The car is in a lock up , I will post some photos tomorrow.
One again thanks for everyones help.

 

[Nodzed]

Thanks for all your comments and suggestions,
I bought the wheels secondhand, they have just been refurbished and fitted with virtually new Falken tyres, they dont appear to be damaged or buckled etc.
The tyre light on the dash is yellow and goes out when the button depressed, it is never red.
The other lights on are ,abs,handbrake, and one other
I did hold the button down for more than 10 secs.will try holding it down for a shorter time
When I fitted the wheels and checked the tyre pressures they were at 3bar, I reduced them to 2.1 bar as per sticker on door post.
When I was fitting the n/s rear wheel I jacked the car up in the wrong place and broke through some plastic just in front of the nsr wheel, I dont suppost there is a sensor of some sort behind there which I may have damaged.

If I dont have any success the old wheels are going back on!

Anyone want to buy newly refurubished wheels in anthracite (grey/blue/) with virtually new Falken all season tyres!!?

I think you have an ABS sensor issue if so the problem won't go away by re-fitting the old wheels IMHO. Changing the wheels should not have made any difference once the FTM was reset. Hope I'm wrong though.

 

[Nodzed]

When I was fitting the n/s rear wheel I jacked the car up in the wrong place and broke through some plastic just in front of the nsr wheel,

Yep thats where the sensor is

 

[Olliebeak]

Some pics of the three lights that remain on .How is the rear abs sensor accessed?

 

[Nodzed]

Never replaced the abs sensors on my Z4 I just replaced the car. Sure one of the Z4 guys will jump in. You may have just damaged a wire.

 

[Olliebeak]

Put the old 16" wheels back on and the fault disappeared , I presume lots of owners change their wheels for a larger size without a problem so the fault must be the new wheels, although these have just been refurbished and appear to be ok.
Just the airbag light to sort now.
ps anyone want to buy a set of 17" wheels with virtually new Falken tyres at a bargain price?

 

[Nodzed]

Put the old 16" wheels back on and the fault disappeared , I presume lots of owners change their wheels for a larger size without a problem so the fault must be the new wheels, although these have just been refurbished and appear to be ok.
Just the airbag light to sort now.
ps anyone want to buy a set of 17" wheels with virtually new Falken tyres at a bargain price?

I am surprised. I cant see any reason for it, the FTM should have adjusted. glad you are sorted though.

 

[ppavuk]

ABS hadnbrake and one other - nothing to do with tyres or wheel. it is something to do with traction control, abs and stabilisation systems. I'd put my money on ABS sensors (these which are on wheelhubs) or for brake pressure sensors (these are on master brake cylinder). It could be also steering wheel position sensor, but they are rarely go wrong.

I'd suggest to get codes rea and post them here. Snap a bmw code reader from ebay, they aren't too expensive, around £30

 

[Olliebeak]

Thanks for the info, if this is to do with ABS,traction control etc why does the fault manifest itself with the 17" wheels and not with the original 16" wheels?

 

[t-tony]

My car came with 17" from factory (square set up) and I fitted a set of 108s (staggered 18") with no issues so I doubt it is the wheel size that's causing the problem. As Peter said you need to get the codes from the ECU.

Tony.