Simply check the ground wires for a good tight clean connection. If good, meaning removed and cleaned (good idea) it probably is the battery is close to it's life expectancy or could have a dead cell, or crack plate and not charging up to capacity. Unless the alternator is not charging properly which is would have to be either bench tested at auto zone or advance auto parts for FREE. I suggest taking the vehicle to either parts stores above and have them do a check on the system for free it may indicate if the battery is going bad, or alternator are the issue. If the ground wires are clean and battery terminals are as well and tight are a good idea to do before having the check done. Easy. Note the check does not require removing the battery or alternator a machine is hooked up to do the diagnosis at auto zone or advance auto.
cause you farted on it
Yes it could.
Bad thermostat
Spark plugs not producing enough spark. Battery doesn't have enough charge. Old fuel.
It could be a stuffed catalytic converter.
cracked or warped flywheel Spring on the pressure plate could have come loose.
Loose alternator drive belt or loose or corroded battery cables. The battery itself may also be bad.
Check for a key off draw (or parasitic draw) Should be less than .5 Amps
the common cause why the light is on is that your alternator is not working well,try to have your alternator checked .may be the carbon brush is already worn out.
Yes, it can ruin the battery by overcharging it. If you are reading between 13.5 to 15.5 volts at the battery with the engine idling then more than likely the alternator is good and you battery has a dead cell. A fully charged battery will read 12.6 volts with the engine not running.
A bad battery terminal(s) connection, bad ground, bad ignition switch, bad starter.
Have you replaced your air filter lately? If not, try that, reset the computer by unplugging the battery and see if it clears the code.