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Use multimeter to check battery power while car is turned off. Then, touch black to black on battery and red to power lead on alternator. This reading should be same as the battery as this wire is continuous flow and always hot. If this reads 0 then the wire is loose from the battery or the charging system fusible link in burnt out and needs replaced. Here it is: http://www.autozone.com/autozone/parts/2000-Nissan-Datsun-Altima/Fusible-Link/_/N-jeaytZ9cih5
You may need to get a 'smoke test' done at a shop. This test will locate the Evap sys. leaks so they can be repaired. Usual cause is a separated or worn out hose in the system. Does the code say which cylinder? May be just a dirty injector that needs cleaned out.
Possibly leaking into oil through a worn headgasket. If exhaust is a whitish-blue color this is prob. the issue. Check to make sure radiator cap is sealed all the way.
Possible that cat has plugged and blew a hole in the flex pipe (the weakest pipe in exhaust) which would account for the noise. Have the catalytic and flex pipe replaced, should restore power immediately. Shop around for prices.
Possible small leak has started and you are losing pressure somewhere. Need to locate leak. Other possibility is master cylinder is starting to fail. Check for small leak first. Check fluid level.
Your ABS system is telling you there is a problem with your brakes somewhere. The right front tire has a flexible line connected to the caliper and the metal brake line. If the leak is as close to the tire as you say, I would inspect this line for a cut or break in it and then replace.
No, but if the brake cylinder has failed it won't recoil after you take your foot off the brake and will keep the pad on the rotor.
You need to change the seal or have a shop do it. Get an estimate.
Lots of possibilites. First check refrigerant pressure to see if in operating range. If not, recharge system and also make sure A/C clutch is engaging the compressor.
The main board blew in the radio.....not repairable time to replace.