Od light flashing something pulling battery down with key out

SOURCE: my 05 Sentra died twice on me and is running very sluggish...

it could be that your fuel pump could be weak. or that it's in the electrical circuit of your fuel system. what that means is that the sensors that help read the performance of your fuel system could be malfunctioning. this would involve the O2(oxygen) the TPS(throttle position sensor. or it could be the fuel pressure regulater. you could probably go to a small garage and have scan done cheaper than if you take it to a dealership.hope this helps please rate this ......thanks and good luck

SOURCE: 95 pathfinder wont stay running and doesnt charge

Check all grounds running from all electrical, If there is not a good contact this problem will occur, when you locate the ground surface take sandpaper or even a knife and scrape or sand the connector and the ground surface then reconnect it, It should return to normal if not then it could be a solenoid possibly but not sure

SOURCE: 95 maxima rough idle

The injector could definitely trigger a misfire code, but you also mentioned that you had a mass airflow sensor code , that code code be responsible for te sluggish moment of the vehicle and rpm going up and down. However if you have a misfire onCyl#6 and the coil and the plug is good the ONLY other thing to cause a mis-fire would be the injector. To check the injector get a NOID light, you can get one at almost any auto-parts place. To use unplug injector plug from the bad injector and connect it to NOID light the light should have a steady PULSE/ligt flickering. If light flickers fine then injector is bad and will need to be replaced. If light doesn't flicker or flickers intermittently then you may have a bad wiring to that injector. Check if wiring is good, then you may have a bad cam sensor or sensor gear. Good Luck and contact if you need more help. Thanks for using FIX YA

SOURCE: 2003 Nissan Sentra won't start

I had this problem recently ie no start on key & found bad earth to engine was cause.
Not my AOE but may be a possibility.
Will eliminate if nothing else.

SOURCE: 2005 nissan sentra battery went dead. got jumped

check to make sure the alternator is charging the battery.crank engine while idling the alternator out put should be 13.5 volts to 14.5 volts. if not alternator is not charging the battery.if alternator is charging battery.the battery is weak.if its over 5 years old its more likely battery.if battery not old checks out good .replace battery cables..