Date registered: Jul 2005
Vehicle: 99 ML430, 00 ML320, 05 E500 4matic Wagon
Mentioned: 20 Post(s)
Quoted: 1008 Post(s)
Before you spend big money on replacing it or the steering column the car should a very good alignment, but before that have the upper control arms and outer tie rod ends checked. If they are worn then replace them before the alignment.
You indicate that the wheel goes to the right. It could just be an alignment or the parts I listed being worn out. I know your guys said the alignment is fine, but I am betting it is not due to the wheel not being centered when they checked it or worn parts in which case a good alignment tech would know the car can not be aligned with worn parts.
In the last 2 months 2 of my MBs with steering angle sensors had the ESP light come on. I put it on the star system and also got a bad steering angle sensor code. In both cars while I was gone with my race mechanic my wife had the regular mechanic do alignments on the MBs and he did have the steering dead straight before doing the alignment. The lights came on immediately after she picked them up.
I got back, had both of them aligned again with the steering wheel centered and the steering angle sensor was happy and the ESP lights went away.
They are a durable part and failure of them is not common, so look to worn suspension/alignment issues first before throwing a lot of money at replacing the steering angle sensor.
Either way it is a straight forward fix. However I would get the steering wheel going to right fixed first. That has to done regardless of the steering angle sensor being good or bad.At that point all codes for the steering angle sensor need to be cleared and the car needs to driven 25-30km. If then once the steering wheel going to right issue is fixed and the error is still there the steering angle sensor may need replacing, but I do not think it will come to that. Something is wrong with the suspension/alignment.