Hi,I have a 99 ES300 the check engine light and trac off light came on simultaneously a few days ago. I pulled code p0330 (knock sensor)I understand the sensors and the labor is expensive,I don't get why when the lights come on I loose overdrive. I don't wanna throw $ into it if it is transmission problems. Do theese cars go into some kind of fail safe mode ? What is the plan of action to fix this problem? Any helpful info is much appreciated! : ) The lights do come off and back on (every few hrs) When there off overdrive is restored,when there on SOMETIMES I still have overdrive. Please help me figure this 1 out Thanx!