Need some help guys.

I had Justin do a tune in February and had no troubles til now or should I say no codes. A couple days ago I started my truck leaving work and the engine light came on, so the following morning I invested in a OB and checked the code. It had two codes the first was P0155(02 sensor heater circuit malfuction bank 2 sensor 1) and the second was P0059(H02S bank 2 sensor 1 heater resistance). I cleared the codes and drove a mile from the house and they came up again. I then pulled the ECU that Justin tuned and replaced it with the stock ECU and have had no issues except the truck runs like a slug again.

What do I need to do to get this taken care of. I REALLY MISS MY TUNE. Any help would be appreciated.

I did a search on these codes and came up with nothing...

 

try swapping O2 sensors and see if it moves to the other bank, indicating a bad sensor.

 

Bank 2 sensor 1 is the passenger side O2 sensor. As to why it's not setting a code with the stock pcm, who knows.

I agree with Trevor - put the tuned pcm back in and swap the front O2 sensors. If you then start setting a bank 1 sensor 1 code you know it's the O2 sensor. Or you could just replace the sensor if you don't want to go to the trouble.

 

Thanks for the input guys, I have been reading threads under 02 sensors using search and what are your thoughts on having them tuned out or using a bypass? Again thanks for your input.

 

you don't want to tune out either b1s1 or b1s2, that controls the fuel trims, i think i had the same codes when my sensor went bad and a new one fixed it. They are definitely not unheard of to go bad. And don't use the dummy sensors on anything, i have heard they are a pain and don't always work right.

 

if it is the rear sensors no problem, but I think your problem is the pre cat 02 which if you bypass you will have to go SD tune. Email Justin with your problem and Im sure he will help you.

 

Thanks again guys. Wasnt sure if it was the sensor before or after the cats. I checked at the Auto Zone and they asked if it was the one before or after Dont know much about it, though he said the before's are a $180 bucks

I did email Justin Thursday and hav'nt heard back from him yet.

 

bank 2 sensor 1 is indeed your passenger front o2 sensor. It's about $80 for a new one.

But the first thing you should do is swap the left and right front sensors as mentioned. Shouldn't take but 10 minutes to do.

 

Thanks for clarifying front from back, I plan on trying the switch tomorrow before I dump 80 bucks. Was going to let the dealer do it on warranty, but cant get it to throw the code with the stock pcm.

 

OK guys, swapped the 02's from left to right(drivers side pain in the a$$) and put the tuned pcm in. Took it for a spin did some hole shots and wot runs for about 30 mins. Did not throw a code.Oh well, this is really strange to me, but at least its running like a truck should again. Any thoughts?