What does the p with a circle around it mean on the bp readout?

if it is a thick cross in the circle it more than likely means first aid
mgsoils

Should consult manual but usually this symbol means either tire pressure or could be brake pad wear if it has a circle with another circle around it such as -- (O)
Sometimes this could also mean your ebrake is engaged. Even if it is not engaged the sensor could be bad.

that is the symbol for tire pressure monitoring system.it monitors tire pressures.check all tires pressures and fill to the recommended pressure listed on the drivers door sill area.light should go out after.if not you may have a faulty tire pressure sensor.

Not sure by the discription , but may be brake ware warning light.

The d with the circle is overdrive...od for overdrive.

"!" means any of your light(head light or brake light or tail light) has burnt out.
Brake with a circle means please check the brake fluid level and brake pads for wear and tear.

Brake pads
●
Have the brake pads checked
immediately.
For your own safety: use only
brake pads that BMW has
released for your particular vehicle
model. BMW cannot evaluate nonapproved
brake pads to determine if
they are suitable for use, and therefore
cannot ensure the operating safety of
the vehicle if they are installed.<

Check Transmission indicator. It means that PCM has detected a problem in the transmission, It should have a trouble code stored in memory now that can be retrieved with a scan tool.

i have a 1999 323 the light that is on is a circle with 3 blocks on each side what does it mean?

Hi, I have just translated the German text you supplied.
I says the brake fluid is too low.
I recommend you check fluid reservoir level (In engine compartment)
If level is already at correct level, it may be due to a faulty level sensor at reservoir.
Hope this helps, MMP