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I am sorry to tell that the gearbox need to have some major repair. It is also not advisable to continue driving as the gearbox can breakdown completely leaving you stranded. At least one the cluster drive gears in the gearbox is damaged (gear tooth stripped off) that will result in that only some of the gears being able to be selected. The broken off tooth are still in the gearbox and due to the oil movement in the gearbox it can be "washed up " in between to engaged gears destroying those as well. This will happen up to the point where there are no gear selection at all.
this would be an internal bearing inside the gearbox on the input shaft......you have the shft coming in form the engine, and the input shaft houses 1,2, 3rd and 4th gears.....the 5th gear is located on an intermediate shaft.....and then you have the output shaft...now if you had said all gears i would have said output shaft bearing......and if you had said 5th gear only, then this would be the intermedaite gear.....
but you are only saying 1,2 and 3......why its not happening in fourth is that the gear ratios that the shafts turn in correlation to thre gearing changes as you get to 4, like on a 10 speed bicycle but in 4th it is a 1:1 ratio, so no excessive loads on the shafts are noticeable....
This would be most likely the first noise of a wearing input shaft bearing. It will only get louder, and eventual failure of the bearing will probably mean catastrophic gearbox failure. It stops when you put your foot on the clutch because the gearbox stops spinning then, and it is quiet in 4th and 5th because there is no side loading (as there is in 1st, 2nd, and 3rd) on the failing bearing. It wouldn't matter what sort of car it was, the gearbox should be overhauled as soon as possible.
im not telling you what to do because it could be a bad transmission and an easy fix but I cant tell without looking at it , but if its a hard fix just go to a reliable junkyard and get another
You need to give the car a scan, preferably with VCDS (or VAS at a dealer). If limp mode is activating (lit up gear selections), then it will be storing codes. The fact that it works to a degree could be good news, the gear box has likely not failed. Could be the F125 selector switch, which is a common fail at this age.
It's under warranty, don't screw with it.
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