car wont go in gear,neither reverse .smell comes out when engine on
And… Can you describe the smell?
With no additional information, I would bet $1 that it is a manual and the clutch is shot.
If I am correct, on a 20-year-old car, if it has typical miles for its age, it would be prudent to replace the dual-mass flywheel and the rear main seal while the clutch is out.
If it is a manual transmission, see if it will go into gear when the engine is shut off, if so, that indicates that the clutch is not disengaging, which can be caused by a failed throwout bearing or chunks of clutch facing floating around between the plates.
Oh, and they used a nylon clutch fork pivot pin. That nylon part can mash down with time so that the clutch won’t disengage. That is a $10 part but several hours of labor so you replace everything while you are in there.