kalle moilanen

Hello
i have an 2010 w212 350cdi 4matic
And the fault is when i drive short distances the abs light dosen't light up but when i drive about 20-30 km the abs and esp lights shows up if i restart the car the fault dissepears but it comes on again after few kilometers

I read the codes and it shows the rear left abs sensor
Fault: Component ''L6/3 (Left rear axle rpm sensor)'' has a mechanical fault. Component 'L6/3
(Left rear axle rpm sensor)' has a mechanical fault. / Fault: No DF11i sensor mounted on wheel
WSS_FL (Signal width is bigger than possible). / Fault: The air gap between component 'L6/3
(Left rear axle rpm sensor)' and the sensor rotor is too large.

This was the fault i got on carly software
Could this be just a bad speed sensor or could it be the magnetic ring

Sorry for bad bad english

Arrie

Seems like the fault codes tell what the issue is, i.e. the left rear wheel speed sensor is either bad or knocked out of place. I have not worked on these sensors in my car yet so I don't know if they can be moved around like if a small rock hits it. I remember my ages old Lincoln Marc VII LSC (Bond Car) where I had a problem with front sensor that had moved out of place by a small rock wedged between the sensor and mounting of it. Easy fix was to remove the rock and re-position the sensor. But, as I said, I don't know if these MB sensors are fastened with a spring clip like my Lincoln had or are they bolted rigidly in place.

The other thing I would look at is the wheel bearing. If wheel bearing wears too much it can allow the sender ring move off place and move the ring too far from the sensor like the error message says about the air gap.

Your finglish is fine...

kalle moilanen

But a bad wheel bearing would make a sound

Arrie

Not necessarily if the bearing is just loose.