jdemusic

New Owner here:

I am SHOCKED how much this car rattles, Ive owner BMW, Lexus and Infiniti. My GF owns a 2020 250. NO issues.

My car - is a rattle trap, and it's kinda embarrassing. I took it to the dealer last week, and lo and behold after a few days of no noticeable noise its back fierce. I dont know what the source of the noise is but sounds like it's lon the right hand side.

Also unrelated, it's a very uncomfortable ride, but im ok with that. "OH ITS JUST A CLA, ITS SUPPOSED TO DO THAT"

Since the dealer cant fix it - is this something a stereo shop or body shop can help with? I'm in bay area CA.

Appreciate any help!

W205C43PFL

Try going from checking tire pressures, replacing tires (unlikely the CLA 45 has run-flats but I am not sure), dropping wheel size & tire size, etc.

Does the vehicle come equipped with Ride Control?

Sockinatoaster

The rattles and squeaks are part of "yeah well it's a CLA." I never have music turned off so I lived with it by drowning it out. But the ride, it's super harsh. The AMG performance seats don't make it any better. I think it's the suspension more than the wheel/tire setup. I have 21"s on my GT 53 and it's a way smoother ride. In my CLA 45 it didn't matter what setting I had the suspension on, every bump in the road broke a tooth. The car rides really low too which may play a part. I work on an Air Force base and there's certain gates I can't use because the spike strips and speed bump hit the subframe.

jdemusic

Is there a setting in the suspension mode besides comfort that will perhaps help (im on comfort)? I suspect the stiff suspension is partly to blame.

W205C43PFL

Does the vehicle come equipped with the Ride Control option and does it come with run-flats?

It is true the 45 will be much stiffer than a 250 though but Ride Control helps, not having run-flats also helps.

jdemusic

yes- I have both.

W205C43PFL

Is the run-flats a must or you willing to go Pilot Sport 4S without run-flats with the good ol compressor and fix-a-flat, tire plug or Tirefit MB calls it.

Getting rid of run-flats certainly will help.

Having Ride Control with the adaptive dampers should had helped as well though since you said you have that.