I need an estimate 4 a timing chain replacement, pulley, & emissions fail codes.

thankyou. i really appreciated this reply.

I already know I have a timing chain and I have seen it as shown to me by a certified mechanic. And YES, I do have a timing belt also shown to me by a certified mechanic. I have also replaced my knock sensor, so I do know something about my car. What I cannot repair myself, I have an actual mechanic do, but I have not had something this extensive done and despite Hayne's manual instructions, I would not attempt this repair.

Ok what ever you say. First time for everything i guess! The 1998 Nissan Pathfinder with the 3.3 L engine has a timing belt,, not a chain!! You must have the only one with both!