For an automatic transmission, there is typically NO dipstick. This is common in newer vehicles. Instead, the fluid level is checked by a technician using specialized equipment that measures the fluid level and temperature. You cannot reliably check the transmission fluid level yourself without this equipment.
Instead of trying to check the level, focus on these things:
* Look for leaks: Regularly inspect the area under your car for any reddish-brown fluid leaks. This is a much more reliable indicator of a problem than trying to check the fluid level yourself.
* Have it checked by a professional: The best way to assess your transmission fluid is to have a mechanic check it as part of a routine maintenance service. They have the tools and expertise to properly diagnose any issues.
* Monitor your transmission: Pay attention to how your transmission is shifting. Any slipping, harsh shifting, whining noises, or delays in shifting are indications of potential transmission problems and warrant immediate professional attention.
Trying to improvise a transmission fluid check on a 2002 Impala without the proper equipment is likely to be fruitless and potentially lead to inaccurate conclusions. Prevention and professional maintenance are key. Focus on regularly inspecting for leaks and watching for unusual transmission behavior.