How do you check the ATF on a 2003 BMW 525i?

To check the ATF (automatic Transmission Fluid) on a 2003 BMW 525i, start the engine and let it warm up to operating temperature. With the vehicle in park and the engine running, locate the transmission dipstick, usually found near the back of the engine bay. Pull the dipstick out, wipe it clean, reinsert it fully, and then remove it again to check the fluid level, ensuring it falls within the marked range. If the fluid is low, add the appropriate ATF, and check for any signs of leaks or discoloration.