By that I take it that the center part of the plug is out and you can see dorn the hole. There are 2 types of removers on the market. One is an easy out that is put in and is turned in the same direction as if you are undoing the plug the flutes on the remover bite into the hole and grip and turn the broken bit. The other is a straight multi flute idea that you hanner in and then undo. . If you can' t get in to do either the only other way may be head off.
SOURCE: changing the spark plugs on 2003 altima 2.5L
Not that simple on newer cars, but you do still need those tools.
Here is a good write-up: Changing Plugs on an Altima that will show you the location of the coil packs that must be removed first (9th picture from the bottom) and what they look like.
Doesn't really need to be done until about the 100,000 mile mark. Do not do it while the engine is hot or even warm. Replace with the factory recommended spark plug. Place a little anti-seize on the threads and some dielectric grease on the top. Be sure you torque them down to the proper setting. I believe it is somewhere around 20 ft. lbs., but if you call the Nissan service desk they should be able to tell you for sure.
SOURCE: how many termostats does a 2003 nissan altima have
There is one thermostat for coolant and it is located at the end of top radiator hose inside the kneck that it connects to. To replace this the hose has to be removed and then the kneck,thermostat is brass colored valve that covers center of hole,clean old gasket from block side and kneck replace with new one and gasket with a bit of rtv sealant tighten kneck evenly when putting it back on,connect hose wait a short while for rtv to set up and should be good to go,"make sure engine is full of coolant b4 reassembling,just pour strait in engine if it isn't or you can damage new thermostat.overheating can also be sign of water pump not working as well so if still having problem then it is possible cause and on older models radiators get clogged.
SOURCE: Is there a way that I can reprogram a key fob
yes u can and here is the procedure.
1. Close and lock all doors with the driver’s side power lock/unlock switch.
2. Insert key into ignition and remove it from the ignition key cylinder at least six times within 10 seconds. Your Hazard
Lamps will flash if you have performed this step successfully. NOTE: Withdraw key completely from ignition cylinder
each time. If this procedure is performed too fast, system will not enter programming mode.
3. Insert key into the ignition cylinder and turn to the ACC position.
4. Within 5 seconds, push ANY button on the remote transmitter. Your Hazard Lamps should flash. NOTE: Do not press
the button more than one time in the above step. If the button is pressed more than one time, the programming
procedure will not be successful.
5. If there are any remaining transmitters (including the old ones), unlock then lock all doors using the driver’s side
power lock/unlock switch and within 5 seconds, push ANY button on the next remote. Your Hazard Lamps should
flash. Repeat this step for each transmitter (including any existing transmitters).
6. Turn the key to the OFF position, remove keys from the ignition, unlock doors using the driver’s side power lock/unlock switch and open the driver side door.
Here is how I replaced valve cover gasket and spark plug seals on my 2003 2.5SL:
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