I have a 2000 chrysler concorde with possible

Knocking and pinging are two separate things. "Knocking" usually refers to the sound an engine makes when internal mechanical parts, such as piston rod bearings or connecting rod bearings, begin to wear and cause a deep "knock, knock, knock" sound during engine rotation. "Pinging" refers to the tapping sound you get upon acceleration, either when using fuel that is to loo octane for the vehicle, or when static timing is set too far advanced, or when the cylinder heads are overheating due to clogged water channels or thin oil.
If you are hearing KNOCKING on the left side, it is likely time for an engine rebuild. If you are hearing PINGING, you may need a better grade of fuel, or you are way overdue for either an oil change or a major tune-up.

These videos shoild help.
Bob
Chrysler Mastertech 1997 Introduction to 2 7L 3 2L 3 5L V6 engines Part 2
Chrysler Mastertech 1997 Introduction to 2 7L 3 2L 3 5L V6 engines Part 3

please be more specific describe the noise if possible post a video it could be anything from a noisy belt lifters ticking or a pulling going bad or worse a rod knocking

loud knocking!!! that is NOT timing. sorry

These tube videof should be helpful.
Bob

Chrysler Mastertech 1997 Introduction to 2 7L 3 2L 3 5L V6 engines Part 3

Chrysler Mastertech 1997 Introduction to 2 7L 3 2L 3 5L V6 engines Part 2

is the noise from the front of the engine or sides? If its from the front its most likely the timing components

yes. it could have overheated or warped a cylinder head or gasket.

Any name brand Ethylene Glycol antifreeze/coolant will do. Mix 50/50 with water and you are set

P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.

more than likely it could be a crank postion sensor but more than likely the tranny is slipping or having torque converter failure.