So i get picked up in my truck from school by my brother (His is in the shop)
so he gives me a little slip from Auto Zone and it reads



TROUBLESHOOTING
-Catalyst Efficiency low- bank 1
Explanation
The oxygen sensors monitor the Catalytic Converters ability
to score oxygen
Probable Cause
-Catalytic converter defective
-Engine misfire or running condition
-Large Vacuum leak
-Engine oil leakage into exhaust - valve guide
seals, piston rings




So i guess i have to change out my O2 sensor on bank 1 right?