Flashing Yellow Triangle supposedly after Wheel Change ML320 W164

Page may contain affiliate links. Please see terms for details.

NP89

New Member
Joined
Oct 31, 2023
Messages
3
Location
Belfast
Car
W164 ML320 AMG 4Matic
Hi all,

New to the forum. Just bought a 2008 W164 ML320 AMG.

I believe the car originally had 19" wheels which have now been replaced with 20" wheels.

New tyre sizes are Fronts: 265/45/20 and rear 275/40/20.

I get the flashing yellow triangle indicating a traction fault but definitely not a genuine traction issue i.e no wheel slippage or spinning. My first thought was wheel speed sensor going bad. However, the seller is adamant that the fault is to do with the new wheels and was fine before - Interestingly if you drive for a few miles sub 45mph and then accelerate up to normal speeds, the fault never reappears after that until you turn the car off and on again, which suggests some sort of automatic calibration happens and not the wheel speed sensor at fault. Obviously this is not practical longer term.
Screenshot_20231029_204232_Facebook.jpg
Has anyone ever experienced this or know the fix? image attached to show wheels if it helps!

Thanks
 
The tyre sizes don't look correct. I don't know what an ML on 20s should have on it - but the combo you have gives about an 18mm difference in diameter and my guess is that is too big for the car electronics to deal with - the wheels are turning at sufficiently different speeds to make the car think that one is slipping - hence the traction control light.
Find out what the recommended tyre sizes are from MB and change either the front, rear or both.
Or put the 19s back on; presumably they were fitted with the correct tyres.
 
The tyre sizes don't look correct. I don't know what an ML on 20s should have on it - but the combo you have gives about an 18mm difference in diameter and my guess is that is too big for the car electronics to deal with - the wheels are turning at sufficiently different speeds to make the car think that one is slipping - hence the traction control light.
Find out what the recommended tyre sizes are from MB and change either the front, rear or both.
Or put the 19s back on; presumably they were fitted with the correct tyres.
Yea I just measured the rim depths and they are 8.5" all round...... so no need for the different profiles I suspect. I dont have the 19" wheels sadly so next step is to swap out the wider rear tyres to match the fronts and see if it solves it. Will update!

This is the reference table:

M Class (W164)​

Rim DimensionsOffsetTyre sizeBrand
17x7.556235/65R17Mercedes-Benz
18x860255/55R18Mercedes-Benz
18x8235/60R18Brabus
18x8<285/50R18Brabus
19x860255/50R19Mercedes-Benz
19x8.558255/50R19AMG
19x8.558255/50R1919x9.556285/45R19AMG
19x8.5255/50R19Brabus
19x9.546295/45R19AMG
19x9.5285/45R19Brabus
20x1046295/40R20AMG
20x8.560265/45R20Mercedes-Benz
20x9.5265/40R20Brabus
20x9.5275/40R20Brabus
22x10265/35R22Brabus
22x10295/30R22Brabus
 
I'm sure that will fix it. Are the 265/45/20s the size recommended by MB? No point buying new tyres only to find that they are not correct.
 
The tyre sizes are usually inside the fuel filler cap
 
OP , you say you want to swap out the rear tyres to match 'width' on the front . Is that a typo ? Width will make little or no difference .

It's circumference (sidewall height) that needs to be 'balanced ' to whatever the cars software is reading at any one time.

The wheels look very odd in the photo , it might just be the camera angle or the suspension is set on the highest position.

As an aside many years ago I had a company car with crude ABS (Vauxhaull vectra) a front tyre was damaged and replaced , the ABS light kept coming on until they replaced the opposite tyre to match up the different circumfrence of the new tyre.
 
Thanks everyone, to update for anyone having this issue in the future, fitting the correct rear tyres with matching profiles fixed this!
 

Users who are viewing this thread

Back
Top Bottom