waynedog

Purchased a 2009 CPO from my local Lexus dealer 4 months ago. Had vibration in seat when driving at highway speed. Have had it in 5 times to be fixed. 4 times for road force balancing, fixing any imperfection in each wheel, etc with no success. Drove with GM this week and he agreed with the vibration and they put 4 new tires on (Michelin Pilot) - I paid for 2, they paid for 2. They said it fixed it. Drove it home (20 miles on highway) - did not help at all - still vibration in seat (rear end). Have put car in neutral at highway speed (drive shaft vibration?) but did not make a difference.

What else could it be?

sktn77a

iTrader: (2)

Putting the car in neutral wouldn't help identify the driveshaft as the source of the vibration (the driveline will be spinning the same as if the car was in drive - it's connected to the rear wheels, after all). On BMWs, this vibration is a classic symptom of worn front control arm bushings. Don't know if this applies to the LS460.

At least you should get 4 new tires out of this (they can't charge you for a repair that didn't work)!

waynedog

Regarding the front control arm bushings, they replaced them during the CPO inspection process. My vibration is all in the seat, nothing in the steering wheel. Could this be from front bushings?

sktn77a

iTrader: (2)

As a rule, vibration in the seat and not the steering wheel is rear wheel balance. In your case, nothing changed when you RF balanced the wheels and then replaced the tires. Could be driveshaft bearing or something else back of the engine. Keep hounding the dealer..... and ask for your money back on their failed diagnosis (tires).

Ascari_2

Check if a rim is bent. Also, move the rear wheels to the front to see if the vibration appears in the steering wheel. If so, then you've pretty much narrowed the issue down to the wheels/tires.