Where are the oxygen sensors on a 2005 Buick Lacrosse 3.8 engine?

Answer 1

On a 2005 Buick Lacrosse with a 3.8L engine, the oxygen sensors are located in two primary places: the upstream (pre-catalytic converter) sensor is positioned on the exhaust manifold, while the downstream (post-catalytic converter) sensor is located on the exhaust pipe after the catalytic converter. You may need to raise the vehicle for better access to the sensors, as they are typically mounted on the exhaust system.