99Nissan altima makes a knocking sound. Just

Have you ever run out of oil? Do you change the oil and filter regularly? That sounds like big end bearings knocking.

Knock Sensor location in the link.

https://www.google.com/search?q=2005+nissan+altima+3.5+knock+sensor+location

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Knock sensor is located very close to oil filter, in fact, to make it easier to reach, oil filter may need to be removed. Held in by one 10mm bolt.

Go back to where you got the work done if you can.If not then i would get the oil preasure checked as the low light tells me the preasure is below 8 psi and the ticking is from the lash adjustors at the tappets verifys low preasure too.

need to determine if its engine or drive train see if the noise stays when you coast or is it in the transmission could be anything from a gear issue to clutch issue may be a driveline issue noise coming from your wheels you need to find the general location of the noise then you can center the issue

It may be low in oil ...in the morning before started check oil level good luck

Yes It could be the timing belt because as your car ages and the belt gets worn it starts to stretch. If your timing belt stretches enough your car will come out of time and that will cause a peck or knock. Another thing that you may look into if you have not had a tune up recently is spark plugs and wires. If you have worn plugs or wires it can also cause this to happen on occasion. I hope this helps you out.

sounds like dirty fuel filter or failing fuel pump.

I would start with the o2 sensor first if its not working right it will set off the knock sensor but beware of vaccum leaks sounds like your running lean

The oil light means you have low oil pressure but not necessarily low oil.
Low oil pressure can lead to serious engine problems and should be fixed right away.

If oil pressure is LOW this vehicle has a safety feature that will prevent vehicle from starting.(check oil level before you start) Now what I wan't you to do is to have the oil pressure switch checked or changed. This may be the reason why this vehicle is not starting or it can also be that the actual oil pressure is low. To check the oil pressure of the vehicle you will need an oil pressure guage. Remove the oil pressure switch and connect guage to oil pressure hole and check oil pressure while cranking vehicle.Some pressure testers can be connected to oil filter housing either is fine. If this vehicle has low oil pressure the reasons for that are bad oil pump, clogged oil pump pick up(from lack of oil change/poor mantainence) or bad connecting rod and main bearings but this usually have a warning from before (the engine will sound loud by knocking /clicking-tapping noise) It this was happening you may need to rebuild this engine or replace it. Good luck and Thanks for using FIX YA