Where is O2 sensor bank 1 2 located on a 1997 Pontiac grand prix se 3800 engine?

The exact location of the O2 sensors (bank 1 sensor 2 specifically) on a 1997 Pontiac Grand Prix SE with a 3800 engine can vary slightly depending on minor manufacturing differences. However, it's generally located after the catalytic converter on the engine's exhaust manifold side closest to the passenger side of the vehicle (Bank 1 is typically the driver's side but always double check your diagrams).

To be certain:

1. Consult your repair manual: A Haynes or Chilton manual specific to your year and model will have diagrams showing the exact sensor locations. This is the most reliable method.

2. Use a parts diagram: Online auto parts stores (like AutoZone, Advance Auto Parts, etc.) allow you to select your vehicle and view diagrams showing parts locations. Look for diagrams of the exhaust system.

3. Visual inspection: Once you have a general idea from the manual or diagram, carefully examine the exhaust system. Bank 1 sensor 2 will be downstream (after) of the catalytic converter on the exhaust manifold/header. They usually have a wire harness connected to them. Be cautious when working near hot exhaust components.

Remember that safety is paramount. If you're not comfortable working on your car yourself, take it to a qualified mechanic.