How many oxygen sensors are on a 2001 Cadillac DTS?

The 2001 Cadillac DTS typically has four oxygen sensors: two upstream (pre-catalytic converter) and two downstream (post-catalytic converter). These sensors monitor the oxygen levels in the exhaust gases to help optimize fuel efficiency and emissions. However, the number may vary slightly depending on the specific engine configuration. Always consult the vehicle's service manual for the most accurate information.