How will you know if your catalytic converter is bad on your 1990 Ls 400 Lexus?

You can tell if the catalytic converter on your 1990 Lexus LS 400 is bad by noticing a few signs. Common symptoms include a significant drop in engine performance, a strong sulfur smell, or a decrease in fuel efficiency. Additionally, if the check engine light comes on, it may indicate issues with the catalytic converter. You can also perform a heat test, checking if the converter is excessively hot on the inlet side compared to the outlet side, which can indicate a blockage.