Does a mazda 323f 2001 model need gearbox oil change after some milage or is it a sealed unit?

https://www.proxyparts.com/wiki/engine-codes/make/mazda/model/323f/

Probably best to get the immobilizer unit, cpu, key and switch from a doner vehicle from the junk yard or on ebay, make sure you dont need the transmission cpu as well. This is a quick fix I have done myself.

This is a very involved process and you really need a service manual or access to a copy of one. You can gain access tot he factory repair manuals for this car at this site: www.alldatadiy.com for a modest fee.

did u try replace the airflow sensor

Check the gap on the plugs and be sure it is set correctly.

depends on model, but im afraid later boxes 2001 on, are called sealed units, there are ways of putting oil in but theres no telling off whether ure box needs oil as theres no dipstick. only thing to do is have a look for a plug elsewhere in the box for topping up, on older models the fill up tube is by the engine manifold.

Can you tell us more?
How many miles on the car?
Which side of the engine area? Drips after you park etc?
Oil ever low? If so how often do you ad oil?
Any visible oil on engine and bay components under hood?

likely areas for oil leaks may include depending on model and make:
Oil pan gasket seal.
Oil pressure sending unit.
Oil filter installed dry or over tightened at your last oil change.
Oil drain plug loose or plug gasket needs replacing.
Valve cover gasket needs replacing.
Crank shaft seals need replacing.
Distributor seals need replacing.
RTV gasket sealer beyond expected life and need replacing for other engine components, inspection plates or covers.

its almost normal.i would switch to a high milage oil at the next oil change.u also might want to change the pcv valve.

next to the battery there is the gear box indicator.get it out and pit the oil with a hose

I am fixing a similar problem on my daughter's 2002 323 Hatchback (Australian BJ model, RH drive) at the moment. Rainwater comes in from above the clutch pedal.

If you look down thru the vents in front of the windshield near the wipers, you will see a spot-welded body seam running across the bottom of that recess. This is where hers is leaking. I originally sealed it with a RTV silicone sealant which fixed the problem but after approximately 6 months it has started leaking again. I am going to remove the silicone and seal over the seam with a brushable bitumen -type sealer.

Remove windscreen wipers and the vent panel for easy access to the area.