I recently replaced my knock sensor. It ran for about a week without a CEL. Then it threw code 23 again. Me and SleepyH22 were looking at the connector and it was completely soaked in oil. I took some sillicone spray and cleaned it out real good. So far the light has not come back. Would the oil cause a bad connection, also where could the oil have been coming from. I know the knock sensor is above the oil filter, but how could it be this covered i oil???

 

You could have a leaky head gasket dripping down onto it.

...or you could have a hole in the oil filter spraying oil....lol I've actually seen that happen before....

 

Thanks for the speedy reply. SleepyH22 also said the head gasket may be leaking. I did not know it could leak like that and not cause more severe problems. What else would you suggest be done to a motor while the headgasket is being replaced. Motor has probably 80-90 thousand miles. Just did a new timing belt and water pump about 4 months ago.

 

How about getting down there and figuring out where the oil leak is coming from first.....

 

Well, it is definately not from under the knock sensor, because we also replaced the oil pan gasket as well as the oil filter housing O ring. I figure the headgasket is the only thing left.