So, does anybody know what is that sensor on the back of the cylinder head for? Dan Simoes wrote: > On the 85/6 4kq, the oil temp sender is at the bottom of the block, > under the car. Look under the car and you will see (toward the front > of the car) a 1-2" long sensor with a phillips head screw, and perhaps > a terminal under the screw. That's the sensor.