Understanding your O2 sensors and there locaion

A6 All/ S6 All
#1

First off a big thanks to both murphenur and nebuchadnezzar. The started this with notes and part number layouts. Some of them have been edited to be correct



                                     Back of car

       Passenger Side (ECU 1)    |           Driver's Side (ECU 2)
       O2 Bank 2     5                |             10     O2 Bank 4
       O2 Bank 2     4                |              9      O2 Bank 4
                                             |
       O2 Bank 1     3                |              8      O2 Bank 3
       O2 Bank 1     2                |              7      O2 Bank 3
       O2 Bank 1     1                |              6      O2 Bank 3

                                    Front of Car

MOTOR ONLY
B1 is Passenger Side;
B2 is Driver’s Side (LHD)

O2 SENSORs
Passenger side B1 and B2
Driver Side B3 and B4

S1 is Front; S2 is Rear.

FRONT SENSORS (precat):

07L906262K - oxygen sensor
S6; Front (B1 S1); Cyl.#1, 2, 3

07L906262H - oxygen sensor
S6; Front; (B2 S1) Cyl.#4,5

07L906262J - oxygen sensor
S6; Front; (B3 S1) Cyl.#6,7,8

07L906262G - oxygen sensor
S6; Front; (B4 S1) Cyl.#9,10

REAR Sensors (after cats)

1K0998262S - oxygen sensor
S6; Rear (B1 S2); Cyl.#1,2,3

07L906265G - oxygen sensor
S6; Rear; (B2 S2); Cyl.#4,5

07L906265H - oxygen sensor
S6; Rear; (B3 S2); Cyl.#6,7,8

07L906265J - oxygen sensor
S6; Rear; (B4 S2) Cyl.#9,10

#2

Here is an attempt to explain more of what you have read above



                                     Back of car

       Passenger Side (ECU 1)    |           Driver's Side (ECU 2)
       O2 Bank 2     5                |             10     O2 Bank 4
       O2 Bank 2     4                |              9      O2 Bank 4
                                             |
       O2 Bank 1     3                |              8      O2 Bank 3
       O2 Bank 1     2                |              7      O2 Bank 3
       O2 Bank 1     1                |              6      O2 Bank 3

                                    Front of Car

The 02 sensors follow the pattern as you have listed here.

B1 = bank 1 S1= sensor 1 in that bank … Then you would have B1= bank 1 =S2 sensor 2 on that bank (post cat)
Since the V10 is broken into two banks per side you have two banks per side The other sensor on that same passenger side would be
B2 = same side of the motor as B1 but the second part of the system S1 = Senor 1 on the second bank

Then you have bank 2 of the total motor or the driver side of the motor. But so as to not confuse Audi techs Audi broke bank 2 or the driver side into new banks noted as B3 and B4

So on the driver side of the motor known as B2= bank two or driver side… Since the term B2 is already being use on the passenger side of the motor on ECU 1 Audi used B3 and B4

On the driver side you have
B3= bank 3 S1= sensor 1 in that bank… then you would have B3=bank 3 S2= sensor 2 on that bank
B4= bank 4 S1= sensor 1 in that bank … Then you would have B4=bank 4 S2= sensor 2 on that bank

So you have
Passenger side B1 and B2
Driver side B3 and B4
The primary 02 on each of these banks will be under S1 and the sensor post cat will be S2

Dont confuse the universal side refrence with the 02 refrence.
Audi calls the passenger side of the motor bank 1 and calls the driver side bank 2. This is for the over all motor but when you talk about the 02s its broken down into 4 banks.

Now to help make this even more confusing as you mentioned you have 2 ecus so the bank 1 ecu on older software versions flashed into the 5.2 motors broke the data into only two banks per ECU and not 4 banks total. So old documentation might still reflect this. But this was obviously hard to dignose so you will notice that all car fax data shows audi had a manditory ECU update to help make a change to 4 total banks other than B1 and B2 per ECU.

hope this helps.

#3

Awesome.

Thanks for posting this and correcting our other thread!

#4

Thanks that was very nice of you. You guys did good work. I just wanted to clean it up a little and make sure it got its own thread. We have a lot of good threads and tons of great info. We might want to start to sticky some of them.

#5

Reviving another old thread, but I’m replacing my O2 Sensors and doing some research.

Adding the Bosch MPN as well now for the upstream sensors.

07L906262K - oxygen sensor Bosch MPN: 17330
S6; Front (B1 S1); Cyl.#1, 2, 3

07L906262H - oxygen sensor Bosch MPN: 17326
S6; Front; (B2 S1) Cyl.#4,5

07L906262J - oxygen sensor Bosch MPN: 17328
S6; Front; (B3 S1) Cyl.#6,7,8

07L906262G - oxygen sensor: Bosch MPN: 17324
S6; Front; (B4 S1) Cyl.#9,10

#6

Thanks for posting the bosch PNs, much cheaper and easier to find now!

#7

No probs.

Rears:

REAR Sensors (after cats)

1K0998262S - oxygen sensor Bosch MPN: 16136
S6; Rear (B1 S2); Cyl.#1,2,3

07L906265G - oxygen sensor Bosch MPN: 16136
S6; Rear; (B2 S2); Cyl.#4,5

07L906265H - oxygen sensor Bosch MPN: 16136
S6; Rear; (B3 S2); Cyl.#6,7,8

07L906265J - oxygen sensor Bosch MPN: 16893
S6; Rear; (B4 S2) Cyl.#9,10

There is also:

Bosch MPN: 17178
2008-2011 Audi S6 (Cyl. 1-3, Upstream Right)
2008-2011 Audi S6 (Cyl. 6-8, Upstream Left)

They must have done some revisions for the 08 and up cars.

#8

Can you confirm if these bosch sensors are the same for an 08 S8?

#9

It’s for all of these cars: (as per Europa Parts - altho they are not the cheapest place to buy them)

OEM: 1K0998262L
MPN: 17178
By Bosch

2009-2015 Audi A4 2.0T (Upstream)
2013-2015 Audi A4 2.0T allroad (Upstream)
2010-2015 Audi A5 2.0T (Upstream)
2012-2015 Audi A6 2.0T (Upstream)
2008-2009 Audi A8 W12 (Cyl. 1-3, Upstream Right)
2011-2015 Audi Q5 2.0T (Upstream)
2007-2010 Audi Q7 3.6L V6 (Upstream Left)
2010-2012 Audi R8 5.2L V10 (Upstream Right)
2008-2011 Audi S6 (Cyl. 1-3, Upstream Right)
2008-2011 Audi S6 (Cyl. 6-8, Upstream Left)
2008-2009 Audi S8 D3 (Cyl. 1-3, Upstream Right)
2008-2009 Audi S8 D3 (Cyl. 6-8, Upstream Left)
2008-2015 Porsche Cayenne 3.6L V6 (Cyl. 4-6, Upstream)
2012-2015 Volkswagen Passat 3.6L V6 (Upstream Right)
2006-2010 Volkswagen Touareg V6 (Upstream Left)
2011-2015 Volkswagen Touareg V6 (Upstream)
#10

Yes the S6 and S8 PN is the same for all of the 02s

#11

EDIT: deleted old post, added no value.

UPDATE: those bosch part numbers, ring up for approx $55 a piece on rock auto :slight_smile: no need for $150+ audi parts!

#12

I should take a pic of the ones I picked up. They look every bit the part with the correct length of wire.

#13

That’s usually the big deal. Some of the rear 02 wires are extra long to accommodate the multi use. The big ones to worry about are the primary 02s those carry the biggest transfer function importance

#14

SO the S6 sensors for cyl 4/5 and 9/10 Which are for the pre cat sensors way up high on the engine. They do not fit the S8, I ordered both sides and they come with short big tails, maybe 15" long. Spec on the S8 Oem long lensors is 1934mm long

Are you able to look up the bosch PN for the following S8 sensors please?
07L 906 262 P (cyl 9/10)
07L 906 262 M (cyl 4/5)

bosch comes back with a 10 number code which returns only searches from europe. Can you find the NA PN equivelent?
Thanks!

#15

^Replying to my own question,found out you can go on boschautoparts.com type in your vehicle info and it will show all the bosch PNs for the parts.
Bosch PN for cyl 4/5 and 9/10 is 17182.
This is S8 specific to get the 30" long pigtail.

#16

Ok good! Was just looking into this.