04 ram 1500 5.7 been having o2 sensor/ misfire dilemma. All new sensors as of 2 months ago. My other sensors are good no codes but for some reason when I plug my b1s1 o2 in it has misfire but no code. When I unplug it theres no misfire but a p0132 as expected. I've checked the continuity from ecu to the plug ive done other stuff that I've read online and I just can't seem go find the solution. Without that plugged in im getting terrible gas mileage.

Also my cats are drilled out with no muffler. I have the sparkplug defoulers in the rear 2 sensors to keep the catalysts codes away. When I first did all that everything was good. No codes, no light, no misfire, but once I get to driving a bit it'll start to misfire pretty bad at idle. If im at a light itll misfire and stall out but if I idle the rpms up to about 1200 it'll be fine. This has been a problem since I got the truck back in June but just kept them all unplugged til recently. I've done all the resets I've moved the sensors around to see if it was a bad sensor. I'm hoping it isn't a bad pcm, thats the last of my findings I've come across but could use some help.

Please and thank you.
Corey

 

What brand sensors?

 

I'm not sure what brand I just know they were bought off ebay for like 50 for the set of 4. I can look and see and let you know here shortly.

 

So I took a screenshot but they are "unbranded" I had thought about that before but figured since the other 3 were good then it was something other than the brand especially since I moved the sensors around and was only getting code for that one location

 

Typically you shouldn't get unbranded parts, especially when it comes to sensors.

 

Yea I didn't realize until after I installed them. I didn't purchase them, my grandfather did. It was an issue before the new sensors as well but ill purchase new ones when I can. Whats the recommended brand to get for the 3rd gens?

 

I tend to hear that Denso is good. Not sure how good NTK is but I have yet to hear anything negative about them. Just stay away from Bosch, these trucks don't like their sensors for some reason.

 

Alright ill look into the 2 and see what the best is and hopefully that takes care of it. Thanks.

 

NTK and Denso were both OEM suppliers. They work great.

If you had the same code before replacing the sensor, then its likely a wiring issue.

 

So I'm back after replacing that sensor and I just got it wired in and started the truck and let it run for a few then I came inside to eat and I went back out about 45 minutes later to leave and I noticed the light was on. Now it's a p0152 code for bank 2 sensor 1 now. Why would plugging in the opposite sensor throw a code for the opposite side like that? Are ethe sensors tied into each other somewhere and I just need to switch wires or what? I'm so over this sensor issue