Emissions light is on

Sounds like the 3rd and last sensor on your exhaust is bad, or wiring to it is bad.

A good scanner should tell which one is bad but you might wind up replacing all of them

BANK 1 Is On Same Side As Cylinder 1---Therefore Bank 2 Is The Other Side--Sensor 1 Is Top Sensor (close to engine) YES--Can Cause To Run Rich And Random Misfire. So Can A Injector. You Probably Should Have It Scanned (in data stream) To Check Function--If It Is Bad, It Will Show. DO NOT REPLACE WITH UNIVERSAL O2 SENSOR.

If check engine light is on. Get it scanned to find the problem code. They will do this at any auto parts store for free, It may be a bad 02 sensor. Get it scanned. A vehicle can fail a state-mandated smog test because a bad, or faulty, oxygen sensor. remove the O2 sensor from the exhaust pipe ahead of the catalytic converter and look for a change in performance. Good-Day!

Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
- Wiring.
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).

Could be the upstream oxygen sensor is faulty and is causing a lean code, have someone with a scan tool watch all the oxygen sensors. compare the 2 front ones and make sure they are fluctuating properly

Hi:
I am pretty sure each O2 Sensor has it's own code.
If you have the code scanned again, it will tell you which one it is, bank 1 or bank 2 . before or after the Cat.

have the engine light code scanned, and it'll tell you if it's bank 1 sensor 1, bank 1 sensor 2, bank 2 sensor 1, bank 2 sensor 4.

Bank 1 is on the same side as Cylinder 1
Bank 2 is on the opposite side of Cylinder 1

Sensor 1 is located before the catalytic converter.
Sensor 2 is located after the catalytic converter

Could be a problem with the Catalytic Converter or oxygen sensor (H02S bank 2 )

dont know lots about this witout engine size but some have 1 coil per cylender possible coil is bad or plug 02 sensor will cause some problems but a miss fire will cause it to run like trash