I have a 2008 IS220d, it have done 80K, I noticed shortly after buying it that the drivers seat wobbles slightly. If you sit in it, and lean back you can feel the base move up slightly, I thought it may just be a bit of movement in the mechanism, but a few days later I was in the passenger seat, and noticed there was no movement. I had a play about and there is definatly movement (up/down) in the drivers seat, and there is also more 'play' in the back of the drivers seat.
I had it back to the garage I brought it from, they had it a day, and said its just wear & tear on the seat due to the age, and that there's probably rivets that have come slightly loose, but as its wear and tear there nothing more they can do as it wont be covered under warranty. I kicked off as they admitted they hadn't even removed the seat to check for loose bolts etc. Eventually after a lot of complaining, and me pointing out that 8 years old or not the drivers seat should not be moving, they agreed to have another garage (that they use) have a look (as their mechanic only does basic work).
It's been in today, and surprise surprise they agree with the garage that sold me the car, saying there is movement in the base and its age related, they've apparently had the seat out (not sure I believe this) and a couple of the rivets in the base have some play in them. Their diagnoses is the seat must just be like that, as in there opinion the passenger side does the same but not as bad (mind I cant pickup any movement in the passenger seat). I asked about replacing rivets, or welding them somehow but apparently they cant do that. The garage I got the car from have washed their hands saying its wear, and tear and only solution would be a new drivers seat, which they wont cover under warranty.
So before I look at getting a 2nd hand interior, is this a known issue with the seats?, if I get a 2nd hand set will they be the same. Are there any bolts/screw in the seats that I can check and tighten. I'm not convinced the garage had the seat out as I suspect in was lip service and the garage that sold me the car told them what to say, as it was just about word for word what the garage that sold me the car had said.