No oil pressure knocking noise

Harvey N Tawatao

• 3854 Answers
• Posted on May 29, 2009

SOURCE: oil pressure problem

You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil. 
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it. 
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine. 
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector. 
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL

SOURCE: ford focus turbo diesel low oil pressure with no knocks from engine

Possible oil sending unit problem.

SOURCE: No oil Pressure, with knock.

The first thing I would do is change the oil filter. Also, what engine do you have.

SOURCE: no oil pressure on my 03 crown victoria

KNOCKING NOISE IS NOT A GOOD SIGN.SOUND IF YOUR ENGINE OIL LEVEL IS CORRECT NOT LOW. SOUND LIKE OIL PUMP AND MAIN BEARING FAILURE.YOU NEED A REBUILT ENGINE OR OVER HAUL.