Here's a new one!

[Dean Fletcher]

P06AF00 code popped up today no EML. I noticed the car power has decreased on the way home earlier and after a Quick Look up it says
Torque limitation or shutoff of the combustion engine has been triggered by the torque control system.
Now the there is a huge coincidence..................today I got some new tyres on the rear.
The story goes last week I ordered some new tyres 255/30/19 Yokohamas when I got to the garage they told me there the wrong size, and wouldn't put them on so they ordered some new ones which are Pirelli P zero MO 255/35/19 and they got fitted today. Is this a huge coincidence or do I need to be going back to the garage. is it because the tyres are so new they slip a bit and the car thinks its dancing on ice?

the speed I was going today I might as well have got a 220d

 

[onefortheroad]

Fronts are 235 35 19 . ??

 

[Dean Fletcher]

Fronts are 235 35 19 . ??

Yeah they are that’s why I’m confused

 

[onefortheroad]

Yeah they are that’s why I’m confused

Rears should be 255 30 19 . It's all on your fuel flap.

It'll be messing with the torque converter in the gearbox. In correct speed sensor signal.

 

[Dean Fletcher]

Rears should be 255 30 19 .

It'll be messing with the torque converter in the gearbox. In correct speed sensor signal.

The previous tyres were Bridgestone and were 255/35/19? But they only had 2mm thread

 

[onefortheroad]

The previous tyres were Bridgestone and were 255/35/19? But they only had 2mm thread

If all that's changed is the tyres , it's pointing to the tyres . Get the right size on and hope it goes away.

 

[onefortheroad]

https://www.obd-codes.com/p06af

 

[Dean Fletcher]

If all that's changed is the tyres , it's pointing to the tyres . Get the right size on and hope it goes away.

I’ll have to phone them on Monday. £400 on 2 tyres . I’ll see what the cars like tomorrow

 

[Dean Fletcher]

https://www.obd-codes.com/p06af

Seems to point to the speed sensor knocking it out of kilter, because the radius is bigger the wheels are not spinning the same revolutions the cars thinks it should for the speed it’s going?

 

[onefortheroad]

Guy in Germany, similar issue . Please read on.

 

[Dean Fletcher]

Guy in Germany, similar issue . Please read on.


View attachment 91563

Makes perfect sense so I need to garage to replace them to the correct size
Especially after I order the right size in the first place

 

[onefortheroad]

Seems to point to the speed sensor knocking it out of kilter, because the radius is bigger the wheels are not spinning the same revolutions the cars thinks it should for the speed it’s going?

Why it's not for starters is it . Folks fit 255 35 19 cos they are easy to find and are cheaper . And add a bit more sidewall . The ratios will be all to pot , until worn I suppose. ...

 

[onefortheroad]

Your rear is half an inch too big . Should be half an inch smaller than the front wheel.

 

[Dean Fletcher]

Why it's not for starters is it . Folks fit 255 35 19 cos they are easy to find and are cheaper . And add a bit more sidewall . The ratios will be all to pot , until worn I suppose. ...

In theory the more hammer I give the car the worse the car thinks the imbalance is. The car was ok for bout an hour. I’ll see if I can clear any codes tomorrow and see what’s what.

 

[Dean Fletcher]

Your rear is half an inch too big . Should be half an inch smaller than the front wheel.


View attachment 91564 View attachment 91565

Ahhh that’s because there wider

 

[onefortheroad]

I wonder why mb didn't go with 255 35 19 then. Maybe aesthetics

 

[Dean Fletcher]

I wonder why mb didn't go with 255 35 19 then. Maybe aesthetics

The rear does sit up a bit more than the front, suppose it’s a way of having higher suspension but the car still looking flat. God knows.
Thanks very much for the help

 

[Dean Fletcher]

UPDATE went back to the garage today
They fitted 255 30 19 and the car is back to normal faster than it’s ever been

 

[onefortheroad]

UPDATE went back to the garage today
They fitted 255 30 19 and the car is back to normal faster than it’s ever been

Hopefully error free now. Surprised it wasn't flashing errors for the previous keeper.

 

[Dean Fletcher]

Hopefully error free now. Surprised it wasn't flashing errors for the previous keeper.

Iv had it a year and it’s never done that before. Perhaps the previous owner put on part worn tyres to get it sold? The tyres were on about 4mm when I bought it.