I have a 93 LS400 with 90K on it. One day when I was driving 60 mph on a highway for about 20 minutes, the Check Engine light and TRAC light turned on(not flashing). But the engine didn't stop and I can still drove it back home.
Then I disconnected the battery to turn off the lights because I want to see will the lights back on again. I drove around local short distance many days, the lights didn't turn on until I drove it to highway, the lights turn back on after I was on the highway certain time.
Does anyone know what is the problem? Is it related to the fuel injector or the oxgyen sensors?
Thanks in advance.