I recently bought an 1991 Ls400 a couple of days ago I got a my car washed with an under body flush then later that day I was pulling out of a driveway and might have gone off a little close tot the curb I heard a thump on the on the rear driver side bumper possibly the muffler about an hour later the TRAC light came on. I tuned the car off and turned it back on a couple of minutes later this time the light was off then about 10 to 15 minutes later the light came back on and it's been doing that every time I turn the car on and off. Any suggestions?
