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Fault Code 08342 - What am I missing?

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Old 02-24-2014, 01:07 PM   #1
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Default Fault Code 08342 - What am I missing?

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 0040
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: 88.0C
Temperature: 15.0C
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.

Click the image to open in full size.

I replaced Number 8 on the image below.

Click the image to open in full size.

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

Click the image to open in full size.

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.

Click the image to open in full size.

The bently really is not very good as compared to using it for the D2.....any ideas what to do next?
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Old 02-24-2014, 01:31 PM   #2
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Could it be #6? It is also Post-Catalyst Oxygen (Lambda) Sensor Correction; Bank 1.
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Old 02-24-2014, 01:32 PM   #3
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For that code, Alldata says you have to check the precat O2 sensor, Post cat O2, which you changed and the cat itself.
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Old 02-24-2014, 01:36 PM   #4
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Quote:
Originally Posted by mishar View Post
Could it be #6? It is also Post-Catalyst Oxygen (Lambda) Sensor Correction; Bank 1.
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.
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Old 02-24-2014, 01:48 PM   #5
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For that code, Alldata says you have to check the precat O2 sensor, Post cat O2, which you changed and the cat itself.
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!
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Old 02-24-2014, 02:06 PM   #6
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Originally Posted by PaulW View Post
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.
Interesting. I thought that bank 1 and 2 refers to the right and left 5 cylinders.
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Old 02-24-2014, 02:48 PM   #7
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Default Four exhaust manifolds, hence 4 O2 sensors up front

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.
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helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.


Last edited by MP4.2+6.0; 02-24-2014 at 03:14 PM.
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Old 02-24-2014, 03:10 PM   #8
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Default I would maybe go for sensor "7" next.

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.
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Current #1: '06 D3 A8L W12 brilliant black w/ amaretto; 4 seat setup, CPO; modestly lowered, H&R 20mm rear and 12mm front DRs with 275/35 on OEM polished + forged 20's; S8 sway bars (see: rear bar and gen'l D3 bar info and front bar); tweaked 385mm front factory brake mod and matching rear brake mod; matching C6 A6 back headrests (better rear view: headrest tweak); owner installed AMI retrofit with part number details here. [If you want pics in foregoing links, ask AW where they went...used all to work] Upper control arm reference (+ more info in replies) here. Lower cost D3 OES sway bar links here.
Current #2: 2013 Q5 2.0T hybrid; Scuba blue w/ chestnut sport interior; Euro delivery 7/2013 (pictured at Ingolstadt); RS5 front brakes
Prior (each modded): 2000 C5 A6 4.2 & '96 C4 A6 2.8Q, both still w/ family; '85 C3 5000S 5 sp FWD; '73 C1 100LS

helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.


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Old 02-24-2014, 03:15 PM   #9
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Originally Posted by PaulW View Post
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!
I'll pull what Mitchell has to say when I get home.
Attached Files
File Type: pdf PaulW.pdf (28.9 KB, 29 views)
File Type: pdf PaulW2.pdf (6.7 KB, 10 views)
File Type: pdf PaulWOxy1.pdf (292.4 KB, 10 views)
File Type: pdf PaulWOxy2.pdf (114.2 KB, 5 views)

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Old 02-24-2014, 04:03 PM   #10
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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.
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Old 02-24-2014, 05:09 PM   #11
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Quote:
Originally Posted by PaulW View Post
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!
Here you go Paul. Hope I'm not too late for you. I will also email you as well.
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Old 02-24-2014, 06:34 PM   #12
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[QUOTE=MP4.2+6.0;24543835]

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..[/QUOT

From my library - looks like there is leak in exhaust somewhere close to O2 sensor front - it shows lean, hence soot on rear sensor. Get under the car with fonendoscope and listen - it may be very small crack - BTDT. :-(
One more - compare voltages from all four front O2 sensors - should see the difference.
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Old 02-24-2014, 06:50 PM   #13
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If the ECM sees a lean condition then it tries to richens the fuel mixture. Sounds counter intuitive that a lean condition will cause you to run rich.
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Old 02-25-2014, 04:44 AM   #14
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Thanks for everyone's response. I was looking at pictures of when I did the transmission flush, and I can see the left hand side O2 sensor in the exhaust when it was disconnected, so it too is black and sooted.

Someone on QW suggested that I go under the car, disconnect the O2 sensor that I just installed, and then see what kind of codes I get. Make sure it's the same one (bank 1, post cat) that I have in my fault code. That's a good first step.

I will consider replacing the pre-cat sensor, as I know that is the "lean or rich" sensor that provides the feedback to the ECU. But for now I will continue to troubleshoot.

I'm not going to go through all the hassle to check if the O2 sensors are working at the plugs, I'm going to say they are (never say never, correct?) because if they were not, I would be getting other types of codes, not just a long term lean code.

I could never find a measuring block that shows the output voltage of the O2 sensors (as I recall).....if anybody knows what that is, I will take that and compare the readings to each other.
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Old 02-25-2014, 04:58 AM   #15
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[QUOTE=Pashamad;24543913]
Quote:
Originally Posted by MP4.2+6.0 View Post

From my library - looks like there is leak in exhaust somewhere close to O2 sensor front - it shows lean, hence soot on rear sensor. Get under the car with fonendoscope and listen - it may be very small crack - BTDT. :-(
One more - compare voltages from all four front O2 sensors - should see the difference.
Pashamad: After looking through google, there is a lot of mentions of an exhaust leak associated with this code. When you say BTDT, does that mean you have had a similar code and found an exhaust leak? If so, where was it and what was the corrective action? Thanks!
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Old 02-25-2014, 08:49 AM   #16
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Pashamad: After looking through google, there is a lot of mentions of an exhaust leak associated with this code. When you say BTDT, does that mean you have had a similar code and found an exhaust leak? If so, where was it and what was the corrective action? Thanks![/QUOTE]

Unfortunately, it's not one sentence talk, e-mail me privately for phone exchange - we'll talk about. (typing with one finger ;-)
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Old 02-25-2014, 03:56 PM   #17
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Hey Paul, looks like the requirements for the O2 test is that the heater for the O2 is good and no exhaust leak between the head and the cat. Obviously you would hear an exhaust leak but you never know.

I think you do have to check the precat O2 sensor as well.
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Old 02-26-2014, 09:21 AM   #18
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Hey Paul, looks like the requirements for the O2 test is that the heater for the O2 is good and no exhaust leak between the head and the cat. Obviously you would hear an exhaust leak but you never know.

I think you do have to check the precat O2 sensor as well.
Again, if you're trying to trace fuel trim issues, only the precat O2 sensors matter. Post cat sensors only monitor cats, any issues there and you'll get a cat efficiency CEL, not fuel trim outside of range.
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Old 02-26-2014, 10:52 AM   #19
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Default Could this be....

a coincidence to the fact that you had recently the exaust removed ?
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Old 02-26-2014, 10:53 AM   #20
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a coincidence to the fact that you had recently the exaust removed ?
The fault code has been around for 6-8 weeks before the exhaust was removed, it has nothing to do with it.
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Old 02-26-2014, 10:53 AM
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