Where is the cap to the transmission fluid under the hood of my 1999 Nissan Quest passenger van located?

SOURCE: transmission

It is on the left rear area under the hood, down low, between the motor and the steering column. The transmission dipstick should be yellow plastic and has a 1/2 inch square hole in the top. Insert a long handled 1/2 inch breaker bar into the fitting in the top of the dipstick, use a two-foot long 1 inch wooden dowel to push back the spring clip holding the dipstick in place, and pull out the transmission dipstick with the breaker bar. You will need a length of 1/2 inch tubing afixed to a funnel to add tranasission fluid. I highly recommend changing the transmission oil often to protect the transmission. Be sure to pump all the old fluid out and not just drain the pan. See Brickboard.

SOURCE: can't locate transmission fluid dipstick

yes it is under the hood!!

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SOURCE: Will you provide belt diagram for 1996 nissan quest?

There are 2 diagrams available:

SOURCE: how do i change my transmission fluid on a 2005 nissan quest

should be a drain plug on tranny pan if changing it is easier to pull pan and change filter if not just have the fluid flushed less mess way easy

SOURCE: where does the knock sensor is located

you have to remmove the intake and it is on what looks like a bracket that bolts to both heads is the knock sensor