What are the symptoms of a bad oxygen sensor in a 2000 Chevy Impala 3.4?

Symptoms of a bad oxygen sensor in a 2000 Chevy Impala 3.4 may include poor fuel economy, rough idling, and increased emissions. The check engine light may also illuminate, indicating potential engine performance issues. Additionally, you might experience hesitation during acceleration or unusual smells from the exhaust, such as a sulfur or rotten egg odor. If these symptoms are present, it's advisable to have the sensor checked and potentially replaced.