2c7c 2c7b Codes on single turbo.

[JimboFresh206]

New rear 02's are still throwing this code.

"Oxygen sensor after catalytic converter: Signal"

throws it on both banks, but mainly bank 2.

I know someone on here had a similar issues and it was that bank 1 and 2 were switched in the Down pipe, and not at the harness connector.

harness, and sensors both DMM fine... My tuner (jake.h) tried a couple revisions but its still cropping up, so i think its clearly on my end.

Unplugging them and cleaning the contacts with de-oxit worked for about a week... but I think that was just a placebo/FUD because new bosch rears are throwing the same code.

 

[WOT808]

I have a Speedtech kit and have been getting those codes since shortly after install (5 months ago). I haven't reached out to Jeff because I haven't had time to check my hardware. I was thinking my o2s got dirty during the install.

I have PI and running pump e85.

The codes seem to pop up shortly after pulls but rarely during cruise.

 

[JimboFresh206]

same, and same...

think we have the banks switched in the DP?

it seems to be killing my gas mileage, but my logs looks normal

 

[WOT808]

same, and same...

think we have the banks switched in the DP?

it seems to be killing my gas mileage, but my logs looks normal

Maybe. Would bank 1 o2 need to be in the bung closest to the flex joint on the DP?
I was thinking the order of the sensors didn't matter because exhaust from both banks are no longer separate after the turbo.

 

[JimboFresh206]

That's what I'm wondering, there's 1 post from @veer90 in the ADV sensor thread, and he was having issues because of that, but that was with JB4 iirc.

 

[veer90]

That's what I'm wondering, there's 1 post from @veer90 in the ADV sensor thread, and he was having issues because of that, but that was with JB4 iirc.

It wasn't JB4 related, and I never had ADVs... not sure what you're referring to.

Do you have single rear O2 enabled? If so bank 2 will throw signal code since only bank 1 rear is being used.

 

[JimboFresh206]

It was just a post you made in the ADV vs. NTK Thread

These are the options I have in MHD, do I need to ask my tuner to enable that?

 

[WOT808]

According to this FCP o2 listing , bank1 post cat o2 is wrapped in black sheath. I've heard the connector from bank 1 can't fit in bank 2's socket.
I took a peep under the car and the bank 1 o2 is in the bung closest to the DP flex joint.

Hard to believe that both of them went bad right after the single install.

 

[Jake@MHD]

Do you have single rear O2 enabled? If so bank 2 will throw signal code since only bank 1 rear is being used.

However, only do this if you have removed the bank 2 rear.

 

[JimboFresh206]

@WOT808 Yeah having a tough time with that too since the new Bosch did the same thing. I have a set of ntk, aswell as a set of Walker rears I'm going to try out today.

It almost seems like a ground issue, or maybe our 02bungs are not in the flow path/the right depth?


@jyamona is that something (single rear 02) I need to ask jake.h to add to my flash?

 

[d8rknight]

I'm about to order this kit. Is this a common issue. I have to go find the FB post I read recently, but it was something along the lines of having one of the sensors codes out or something.

 

[JimboFresh206]

Nope, sorry forgot to update.

The bosch 02s I got from auto-zone had some issues, but a set of NTK's from rock-auto did the trick.

pretty sure i just got a set from autozone that had been dropped or something, they were missing the plastic caps when they arrived.

 

[Blackarrow335i]

I had the same issue like everyone in here I’m also on a speedtech kit! 4 new sensors (ntk) did the trick for me as well!

 

[WOT808]

Nope, sorry forgot to update.

The bosch 02s I got from auto-zone had some issues, but a set of NTK's from rock-auto did the trick.

pretty sure i just got a set from autozone that had been dropped or something, they were missing the plastic caps when they arrived.

What are the part numbers for the NTKs you got?

 

[JimboFresh206]