My edcated Guess would be to open the hood, unscrew them and replace them.
It would be nice to know the year of your Nissan Altima. For Nissan 2000 Altima GXE the air filter is located right next to the battery. Just push off the 4 clips that hold the top of the filter housing and pull the top off just enough to remove/replace the air filter. Close it and and pull the clips back on.
Because there is a hole in the hose! Replace the hose
If just the knock sensor need to be replaced. I would say no more than $150.00
The mirror is held on by bolts on the inside of the door.
It cost me less than $3 if you talking about the bulb...not sure about the cover too
I would suggest you visit Nissan Of Fort Worth 2900 Alta Mere Drive, Fort Worth - (817) 560-9000. Nissan of Fort Worth is the largest and best Nissan Dealers in the area.
It is common to have a knocking or clunking noise of a 99 Nissan Altima, even after the struts have been replaced. This may be due to worn ball joints. It is best to replace the ball joints, too.
Depending on where you go you would usually be charged between $50 and $150.
Because you can't drive a stick, and its a hard carto drive stickin and first is geared lower.
depends on your expertise. me it would take a week and I'll have plenty of parts left over. a friend of mine can do it in less then a day.