What does it mean when the engine ligth is on, every seems to be working just fine , but I am worry about the engine ligth, what do I need to do?

Did you check to see if there is a fuse on the brake lights circuit?

If you changed the lamps and the brake switch it is obvious that they are not being energized.

P0700 Transmission Control System (MIL Request)
It just means that the MIL is being requested, but there don't seem to be any other codes associated with it, so I wouldn't worry about it unless a driveability or fuel economy or engine/transmission performance problem arises.

engine check light. needs a computer scan and check. needs a workshop.

the computer needs resetting to accept the new key

Something is wrong even it you car seems fine it is most likely is a bad sensor. most auto parts store can tell you what the code means for free. I you need any more help let me know

Change the oil pressure sender -- most likely defective

your brakes will work just fine. the abs light means your car will not have abs. if you are ok driving your car without abs then dont worry about it. if you drive in a lot of snow or just want abs then i would take it to be serviced. it could be something like a wheel sensor that went bad or bad wire or you abs or if you replaced a caliper or something like that it could just be air in the lines but then you would notice that the brakes are spungy. it might not be a bad idea just to check the fluid level and go from there.

The check engine light indicates a problem, many times the car will run fine, or seem to, but u should get the codes read to determine what's wrong, and correct the problem, as it can lead to other troubles. Not sure about parts stores in Australia, but in the US they offer free car checks of trouble codes when the engine light is on. They plug a hand held scan tool into a port under the dash, and 'read' any codes stored in the cars computer. Write down the numbers for your records, and ask them what the codes mean, and how to fix the problem. If u have any questions, post them here w/ the codes for help.

hi it sounds like you've "cooked" the engine lost all water and blown headgasket unfortunatly this will be a very expensive repair and depending on the amount of damage to the top end COULD mean a replacement engine chris

Dont be worried at all. The battery temp sensor isnt very important, most cars dont even have them. The only thing is you will have that light on. Good luck!!