Having problem with check engine light its showing that theirs a lean on bank 2 code P0174/P0171 what would be the cause could it be my cadaylac converter

No.The catalytic converter will set a po420 code.But your o2 sensors will set these codes.What you can do is swap the o2 sensors from side to side.This would be the right side to left side and see if it changes to bank 1.Bank 1 is front left and bank 2 is front right for o2 sensors.If it does replace the o2 sensor that is causing the problem.Good luck.

What this codes indicates is you are running lean on both sides of the motor 171 is right side and 174 is left side.

Lean means either low fuel pressure or big vacuum leak. Since you have no cylinder misfires I would inspect the MAF sensor first. If you installed a K/N filter the oil on it could of contaminated the MAF sensor fine wires. Or you may have a air filter that is clogged.
You can clean the MAF with brake clean being careful not to break the wires.
Or inspect for a large vacuum leak that could affect both sides.
Or if all else fails have the fuel pressure checked.

14.7.1 part air to 1 part fuel is what the computer tries to maintain
.It needs this to get the best bang for the buck

A big vacuum leak or low fuel pressure will change this
If the computer sees a big vacuum leak it will add fuel until it cant anymore. This is when the code sets.
Same thing for low pressure. It will set the code because the engine stays lean for too long.

Check for intake manifold gasket leak.

Addition air leaks into the system will offset air/fuel ratio.

===========

Ran two tanks of Chevron at clean out carbon deposit.

Use a small bottle of Lucas upper cylinder clear/fuel system cleaner will also help.

========

Catalytic converter blockage will give slow acceleration problem alone with a HOT RED glowing cat.

Basically these codes mean that an oxygen sensor(s) in banks 1 & 2 detected a lean condition (too much oxygen in the exhaust).
The codes may mean that one or more of the following has happened:

• The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
• There could be a vacuum leak downstream of the MAF sensor.

• In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
• Inspect all vacuum and PCV hoses, replace if necessary
• Check for a dirty fuel filter and proper fuel pressure