it looks like oil is leaking from this part and pooling up on the motor, is this a common problem and can someone tell me exactly what part this is. From what I have seen online so far it might be an oil pressure sensor. If it is, how many sensors are there and what one is this so I get the right part. It is right under the alternator. A video link on how to change it would be helpful as well. can it just be taken out and reached with a socket or do I have to remove the alternator. thanks