PaulW

I've had a fault code for a few months now:

Monday,24,February,2014,13:36:05:13622
VCDS Version: Release 12.12.0 (x64)

Address 01: Engine Labels: Redir Fail!
Control Module Part Number: 4E0 910 552 A HW: 4E0 907 552
Component and/or Version: 5.2L V10/4V FSI ª0040
Software Coding: 01060009190F0260
Work Shop Code: WSC 25166 444 92450
VCID: 204582A6F3F6D51EB43-8075
1 Fault Found:

008342 - Post-Catalyst Oxygen (Lambda) Sensor Correction; Bank 1
P2096 - 002 - Too Lean - MIL ON
Freeze Frame:
Fault Status: 11100010
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 94544 km
Time Indication: 0
Date: 2014.02.22
Time: 14:21:27

Freeze Frame:
RPM: 1484 /min
Load: 26.3 %
Speed: 52.0 km/h
Temperature: 88.0°C
Temperature: 15.0°C
Absolute Pres.: 990.0 mbar
Voltage: 14.605 V


Readiness: 0000 1001


I've checked my intake on the right hand side, and checked it on the left hand side....everything looks good.

So then I decided to change the Bank 1 O2 post cat O2 sensor, which I did this weekend. When I removed it, it was coated in carbon....new O2 sensor on the left, old one on the right. However, it was easily cleaned.



I replaced Number 8 on the image below.



I've taken a couple of screen shots of measuring block 32 over the past few months, and it is always this:



After a day of driving, the check engine light came back on. Same code. Here is a screen shot of measuring block 32. It seems to have changed a bit, but maybe I need to drive the car for longer to see if it's the same as before. I reset it and will drive it again and check it in a week.



The bently really is not very good as compared to using it for the D2.....any ideas what to do next?

mishar

Could it be #6? It is also Post-Catalyst Oxygen (Lambda) Sensor Correction; Bank 1.

TSHong

For that code, Alldata says you have to check the precat O2 sensor, Post cat O2, which you changed and the cat itself.

PaulW

On the V10, there are 8 O2 sensors.....Bank I and Bank II are the right hand side, Bank III and IV are the left hand side. It took me a while to figure out, but I figured it was just Bank I.

And I had the whole darn exhaust off a few weeks ago with Gabor when changing my transmission fluid. Changing the pre-cat O2 sensor will probably take a trip to the shop and remove the exhaust again.

PaulW

Thomas....would you be so kind to either PDF those directions and send them to me (how to check the O2 sensors and cat), the Bently on my old laptop is hurting and I just can't find the info. I used to be able to find anything so quickly. Thanks!

mishar

Interesting. I thought that bank 1 and 2 refers to the right and left 5 cylinders.

MP4.2+6.0

Same as W12. 1 and 2 on left/North American passenger side if orientation is looking into the engine compartment, 3 and 4 on right side. W12 has it divided in even 3's. V10 uses a 3+2 division.

MP4.2+6.0

Kind of %^%'ed where it is though. On the W12, that forward B1S1 sensor is under the air box in plain sight; just changed it on mine per a code for it specifically. To confirm, that would be the "Bank 1" forward sensor that handles the first several cylinders on the passenger side on yours.

FWIW, by the way I call this the "left" side, just like w/ spark plugs and cylinder numbering (looking into hood), but I can see why with these so far back and w/ the illustration you posted you are calling these the right ones.

Stepping back from the codes though, that's a head scratcher. The carbon on the old sensor really suggests rich, not lean to me. Lean should be toward white, but certainly not sooted like that. So the visual doesn't agree w/ the lean code to me. Starts having me think about things like the air pump maybe pushing too much air/not shutting off after converters up to temp, or maybe a bad converter as mentioned in another reply.

Petahs

I'll pull what Mitchell has to say when I get home.

halik

You replaced the wrong O2 sensor, the post-cat ones only measure cat efficiency. The front o2 sensors are the ones that get measured for fuel trims.