Airmatic malfunction; car pulls to right; airmatic sensor replaced
Thanks to the excellent recommendation by guys like BerndV and others, got the Conti DWS's all around and the NVH is indeed so much better with very little compromised in dry/wet on performance. My fronts (stock tires) were basically bald and the rears were half way so I just replaced them all at once, I'm at 14,500 miles and had no major issues with wheels/tires or air-tragic (airmatic)
Before getting the continental tires, I initially brought the car in because it had a vibration over 50mph, in the steering, in the body of the car, and more pronounced when I would move the steering left or right such as in a lane change maneuver. The checked rims, no bends/cracks (I have the wheel tire protection), said the fronts needed replacement but that the rears which were fine (tires and rims) needed re-balancing. No issues at that time with my suspension that I knew of.
They recommended an alignment with the change of all four tires, as I chose the conti's, and this made sense. When I got the car back, the vibration still seemed to be there a bit, but much better. And the car definitely pulled gradually to the right. Now this was NOT the road crown, and NOT normal for benz's to pull to the right (I read this a lot from some people on the forum, and this is incorrect, a benz should drive straight as an arrow when correctly aligned). I definitely became annoyed having to recorrect the car frequently to get it to stay in lane, and did NOT have any alignment or pulling issues whatsoever with the stock tires up to that moment that they needed to be replaced.
So I put it comfort suspension (I always drive in S+) and got "airmatic malfunction" which I thought was odd but seemingly unrelated. The suspension felt fine and the cars height seemed symmetric and normal for the S+ that I always drive in, yet it wouldn't switch to S or C suspension setting. I restarted the car and didn't try any more airmatic switching as i didn't want to be stranded and brought it in again.
After three days, they found the problem to be an airmatic sensor that wasn't reading correctly, and they noted the pull to the right immediately. They checked the alignment specs and data and it all seemed to be done perfectly so they replaced the sensor and the car drove straight again, and I concur -- it's back to driving totally normal, straight, and no vibrations.
Just and FYI to anyone out there getting something similar. Not sure if an airmatic sensor got damaged during tire replacement, but it was ironic that the suspension malfunctioned and caused the pull to the right immediately after I had the tires replaced.
Cheers




FWIW, after replacing the stock air springs with Arnott air springs at 93,000 miles, I found calibrating the Airmatic suspension resolved any issues I had with the suspension. Easy fix to the problem although it seems difficult. One hour to resolve with the proper tools. Knowledge is power.
I was excited about the fact that my M157 only has airmatic on the rear for 1/2 the problems

but now I have the yellow malfunction airmatic message so car is at dealership since i have CPO and no reason to do the repair myself.... pretty sure its the compressor
Last edited by gaspam; Sep 26, 2016 at 11:21 AM.
Currently, I keep hearing air escaping sounds from the rear while driving. I do not remember hearing that ever before. Anyone else hear that?
I know those sounds happen when the car is parked, but I didn't think it did that when the car is moving too (or maybe I never paid attention before?)
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Bentley, range overs, audi uses them as well and they are all high end luxury brands, must be a reason for it
Also MRC is a different approach than airmatic. MRC addresses the shock absorber aspect of things while airmatic addresses the spring (coil Springs) aspect of things. Different ways to slice the cookie but ultimately end result is what you are looking for. Ride height control on the fly is lost with MRC for example even though MRC kicks *** in almost every other category.
Last edited by kponti; Sep 28, 2016 at 05:28 PM. Reason: Quoted wrong post
Also MRC is a different approach than airmatic. MRC addresses the shock absorber aspect of things while airmatic addresses the spring (coil Springs) aspect of things. Different ways to slice the cookie but ultimately end result is what you are looking for. Ride height control on the fly is lost with MRC for example even though MRC kicks *** in almost every other category.




