A scan tool is needed to reset the seatbelt light, unhooking the wires turned the light on as a fault, a scan tool will reset code. also make sure all connectors are connected good, the computer may reset itself after it sees a few key cycles and tests the system and it passes but it may take awhile. i have seen some that will stay on until they are reset, if the light is still on after all this time then a scan tool will be needed to turn off the light. good day.
Likely a head gasket problem, between the water jacket and the one cylinder. Look for bubbles in the radiator with the radiator cap off before it heats up. Or run compression check on that cylinder. See if it holds the pressure after you stop turning over the engine.
Error code p2101 involves the electronic throttle control. Which essential controls your throttle, the car won't accelerate if the code went away and came back after you changed the battery chances are it's just the throttle control sensor which isn't that expensive to replace.
What size engine ? The clicking you hear is probably the starter relay , provided you hear the click while turning the key to the start position . That black box is the fuse / relay junction box. Testing the starter electrical circuits with a volt meter is the way to find the problem . Voltage drop testing . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model and engine size . Under system click on engine then under subsystem click on starting . Click the search button then the blue link.Does your vehicle have a manual or automatic transmission ? First blue link for a manual transmission ,the second link for a automatic transmission . How to voltage drop test starter motor circuit