I have a 92 sc400 and I have done many maintenance to it but I have this problem the check engine and trac light are on and the car is in limp mode so very poor acceleration ..........if I disconnect the battery for like three days the car will run excellent and very fast for a couple blocks then lights come on and accelerates horrible no power........I have rebuilt the tranny but suspect it wasn't done right.......I have got the codes 41,61, and 67.......but I changed the speed sensors already........took it to a shop and was told there is no signal going in the trac and abs computer.........help thank you

 

Maybe your trac accumator went out?
Either way i dont see why it would cause limp mode.
Try these https://www.clublexus.com/forums/showthread.php?t=551125

 

Where is this located