Getting p0130 p0150 p0174 p1174
replaced front o2 nothing changed my short term fuel trim is 25 then 0 then back again on both. Ultra gauge shows voltage at .100-.035 upstream and downstream is .850 no idea what the problem is smells like raw fuel when in closed loop

 

Try cleaning MAF maybe? Sometimes it's the simple stuff.

 

I tried replacing maf from parts vehicle and it did same thing

 

Could be so many reasons but I had same issue
the connector sometimes gets gummed up or wires not in properly
also if you have a bad fuel purge valve and sticks open you dump vapours and in my case it made engine run like crap and stinks like raw fuel or just rotten eggs and throws the bank 1 sensor 1 code

also a good smoke test to make sure you don’t have vacuum and exhaust leaks

 

Get the Torque app, an ELM327, and chart a graph of the 02. Did you swap left and right? Follow sensor? Check it when stone cold - if the sensor is any good it should go full .9-1.0 volt on cold start. If it doesn't, you have either a bad sensor or bad wires.