Believe Nissan about tune ups a the ECM does it every second
when the tune up fails you run the fault codes and replace the faulty part or fix what has broken
plugs will last the life of the motor especially if you pay the extra for platinum plugs
you can help by regularly using quality injector cleaner and having the codes read every so often
batteries are checked with a load tester
Alternators are bench tested and starter motors have to be removed and bench tested
the codes were oit read properly as the engine light operation is a fault recorded and the engine failing to start are other fault codes
SOURCE: Car Battery draining over night
Something is shorted and it could be very difficult to find sometimes. It could be something as simple as a button being pressed when it shouldn't turning on a light or feature that runs all the time, but in a 2001 that is unlikely as it should turn off all lights after a certain period of time. It could be something in the radio. What I suggest is to pull one fuse at a time for accessories, check your manual for what each fuse powers. If the battery still drains with that fuse out then put it back in a pull another. When you find the fuse that allows your battery to keep it's charge then you will have a much smaller field of offending components.
For example, if you pull the fuse that powers the radio and heater, and the battery keeps it's charge then you know it is either the heater or radio causing your problem.
This can take a few weeks to do completly but won't cost you a penny to do.
SOURCE: 1996 Nissan Sentra Idles Roughly, Cuts Off, Engine Light Stays On
if this is an automatic there will be a dip stick if it is a manual you do not use transmission fluid to find out what sencor is bad take car to advance auto parts they have a digatal reader and can tell wou what sencer went bad and where it is located
SOURCE: 2005 nissan frontier crew cab won't start
Make sure you have 12 volts from the positive side of the battery to the starter. Check the small wire on the starter solenoid and make sure you have 12 volts when cranking engine. If voltage is correct, the starter is bad
SOURCE: Tune up nissan altima 2.5L model 2002
All you really need is a good set of spark plugs, this car has coil packs so no plug wires distributor caps etc.....Just remove the coil packs and install your plugs and your done. Good luck.
SOURCE: Nissan Xterra EGR valve troubleshoot
check the EGR by disconnecting it to see if there is a change in the engine at idle
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