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C11BRA
Imola


Joined: 30 Mar 2015
Posts: 751
Location: North London. Herts.


PostPosted: Sat Feb 01, 2020 12:13 am    Post subject: Now I have an X pipe, do I need to swap over the O2 sensors? Reply with quote

Hiya.

Just had a thought. Do I need to swap over the Post cat O2 sensor connectors now I have an X pipe?

Originally. Bank 1 exhaust pre cat O2 sensor would connect to N/S chassis plug. And bank 1 post cat sensor would connect to the O/S chassis plug.

However, now I have the X pipe. The bank 1 post cat sensor is now nearer the N/S. (in theory). Or do the gases still cross over at the X junction?

These sketches might help?

Top pick shows the factory O2 sensor connections.






Where do the gases go?






_________________
2006 997.1. Project GT3C. C stands for ???
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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Ronyted
Newbie


Joined: 09 Jun 2018
Posts: 7
Location: Cannock, Staffs.


PostPosted: Sat Feb 01, 2020 4:56 pm    Post subject: Reply with quote

Hi have a look at this https://youtu.be/kjo9MWSpuZA
a demo from fabspeed.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7829
Location: Brighton


PostPosted: Sat Feb 01, 2020 7:02 pm    Post subject: Reply with quote

The sensors stay the same side .. they are to monitor the gases before and after the cat so they are fitted the same as pre X pipe installation .

Bank 1 pre and post should both connect to the n/s/r with B2 the o/s/r .. i dont understand if you are saying it was different .. it shouldn't be .
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C11BRA
Imola


Joined: 30 Mar 2015
Posts: 751
Location: North London. Herts.


PostPosted: Sun Feb 02, 2020 12:19 am    Post subject: Reply with quote

My car had cat bypass pipes. Bank 1 pre cat sensor was close to the NS. However, the bank 1 post cat sensor was close to the silencer joint on the OS. I didn’t take photos but I seem to remember it being plugged into the OS chassis plug. Because it was closer. I’m not even sure it would reach the NS.

I’ll put some photos up tomorrow.
_________________
2006 997.1. Project GT3C. C stands for ???
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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C11BRA
Imola


Joined: 30 Mar 2015
Posts: 751
Location: North London. Herts.


PostPosted: Sun Feb 02, 2020 2:34 am    Post subject: Reply with quote

This might explain my worries.


_________________
2006 997.1. Project GT3C. C stands for ???
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Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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Magic919
Barcelona


Joined: 05 Jun 2013
Posts: 1314
Location: Berkshire


PostPosted: Sun Feb 02, 2020 7:50 am    Post subject: Reply with quote

I wouldn’t worry about it. If you ever get post cat sensor alarms, just bear in mind where each is located.
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C11BRA
Imola


Joined: 30 Mar 2015
Posts: 751
Location: North London. Herts.


PostPosted: Sun Feb 02, 2020 10:55 am    Post subject: Reply with quote

The car was running super rich. And all 4 sensors would be stored as faults after 2 or 3 drives. Check engine light would come on.

It did have the post cat O2 sensor extensions to weaken the results. And a re-map apparently. But the light would still come on.

Maybe it’s a blessing that I didn’t take notes of which sensor wires went where. Because if they were wrong, they would still be wrong.

De Mort says both Bank 1 sensors plug into the NS chassis plug. So that’s how it’s gone back together.

Let’s see what the lights do.
_________________
2006 997.1. Project GT3C. C stands for ???
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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C11BRA
Imola


Joined: 30 Mar 2015
Posts: 751
Location: North London. Herts.


PostPosted: Sun Feb 02, 2020 11:18 am    Post subject: Reply with quote

I think it was plugged in wrong before. Satisfying to know it’s correct now.

I sent you a PM De Mort. But all my PMs are stuck in my outbox and won’t send. Any clues why?
_________________
2006 997.1. Project GT3C. C stands for ???
2018 Audi A4 Avant Black Edition.
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Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7829
Location: Brighton


PostPosted: Sun Feb 02, 2020 5:09 pm    Post subject: Reply with quote

Pm,s are stored in your outbox until the recipient logs on and reads them .. i'm only here in the evenings so i have just got yours Smile

It seems to me it was originally wrong but a swopped post cat sensor side to side won't make any difference .. all it will do is throw a fault code for the wrong bank in the event of a cat or post cat sensor failing .

Pre cats swopped is a much bigger deal .. the car will run bad and log fault codes / eml pretty quick.

Running rich can be caused by various things but Maf and Lambda sensors are the more common causes .

EDIT ..

Post cat sensors are there to monitor the condition of the cat Only .. they have no effect on the running of the car.
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My Daughter's Crowdfunding has hit the target .

Thank you all so Very much .

She's not going until july 2020 though .



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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7829
Location: Brighton


PostPosted: Mon Feb 03, 2020 6:51 pm    Post subject: Reply with quote

This has been bugging me today .. i don't like the fact you had all 4 lambda fault codes ..

I would be interested to know what the codes are though .

i was thinking .. is it possible the lambda sensors have been mixed up and the post cat has had the pre cat sensor fitted .. that would certainly cause issues .

A couple of images below ..

The Grey plug sensor should be fitted into the post cat hole .. so it's the after cat sensor .

The Black plug Sensor should be fitted in the pre cat hole .

As you can see these are the bank 1 sensors and both fitted to the n/s/r .
_________________
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My Daughter's Crowdfunding has hit the target .

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

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Indy Mechanic .
 



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