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The engine in your 2003 Nissan Altima should be running when you perform a transmission fluid level check, otherwise it will be inaccurate. The video above shows where the transmission fluid dipstick is located in your Altima and how to check the transmission fluid level. If the transmission fluid level in your Altima is low, you need to add transmission fluid through the dipstick tube. When adding transmission fluid to your Altima, be sure to add it slowly as it will fill up quickly and is difficult to remove excess fluid if you overfill.
If you are having problems with the transmission in your Altima, such as clunky shifting or hesitation, check the fluid level first - it is amazing how many drivers pay thousands of dollars for transmission work when a half quart of transmission fluid would have fixed the problem.
Minor transmission fluid leaks can often be fixed with the right sealant - see how to do this2006 Nissan Altima SE 3.5L V6
On many cars, the high beam bulb runs at reduced power during the day - check 'em and change 'em!2006 Nissan Altima SE 3.5L V6
If your car is leaking a small amount of power steering fluid - see this video on how to fix the leak2006 Nissan Altima SE 3.5L V6
Flushing the coolant in your car is not that hard and will extend the life of your engine tremendously - learn how here!2006 Nissan Altima SE 3.5L V6
Learning how to jump your car before you need to is an excellent idea2006 Nissan Altima SE 3.5L V6
If your brake fluid is a little low, learn how to add some here. Ignoring a low level leads to big problems2006 Nissan Altima SE 3.5L V6