1996 GMC 1500 5.7 Vortec 02 sensor code po153

[cagee2000]

Has anyone ran into the po153 code before? This is on bank 2 sensor 1. I replaced the OEM o2 with a Bosch everything seemed to be fine for a while then I started getting a po153 code. so I figured that maybe it went bad and also a lot of people say not to use a Bosch o2 sensor. I replaced the Bosch with a Denso but now I am still getting the po153 code. Unfortunately, I do not have a way to graph the o2 sensors to see performance. But I can see the MV output it seems to be polling up just fine whilst I'm watching it. I'm thinking that maybe a wiring issue? could it be a loose ground? when I delete the code it doesn't come right back I can go 10-15 miles and it may come back on sometimes it will and sometimes it wont its very inconsistent. Also, was thinking about cleaning the MAF maybe that will help? Thanks!

 

[cagee2000]

PO153-HO2S Slow Response Bank 2 Sensor 1

 

[Schurkey]

Verify fuel trims, and check misfire counts for each cylinder. Look for exhaust leaks on Bank 2.

 

[cagee2000]

Verify fuel trims, and check misfire counts for each cylinder. Look for exhaust leaks on Bank 2.

I'm sure of no exhaust leaks on Bank2. I will check into the fuel trims and misfire counts. I will follow up with results. Thank you!

 

[crowfather]

Did you have any further luck with this?

I have the same code but haven't bought parts yet. Was surprised to see DENSO sensors on rock auto for $25 each, compared to GM($50) or NGK/NTK($40).