Replace the EGR valve. It routs 1200 degree exhaust into the 1800 degree combustion chanbers to decrease preignition and reduce nox.
Bearing needs to be replaced
No oil pressure
Timing chain usually needs to be replaced each 180-200K miles.
Sounds like your heater core needs to be replaced.
Your High/Low switch is bad and needs to be replaced.
A 1999 Toyota Camry needs four quarts of oil :-)
how do you check to know whether your coolant fan motor needs replacing in my 1993 toyota camry v6?
sounds like your coolant lines, heater core, or both needs replaced. i just replaced the heater core in my truck with the same problem
How do you know if it needs to be replaced
In general, engine thermostats can be found by following the LOWER radiator hose to where it attaches to the engine. The hose is typically attached to a fitting behind which is a gasket and the thermostat. The gasket needs to be replaced when the thermostat is replaced.
it probably needs a new battery
There is no real reset procedure. The problem needs to be diagnosed and repaired, when it is properly repaired the light will turn off by itself