Oxygen Senor Brand and part numbers

A6 All/ S6 All
#1

I’m at the point where I think I need to get my sensors replaced. I’m still getting lots of misfires under high load. So far I’ve done carbon cleaning (twice actually), new OEM spark plugs, New Coils, cleaned injectors from JHM, new intake manifold and JHM spacers, new battery. Not really getting many codes for misfiles but it runs super rough if I get into the throttle too hard while on the interstate. So now i’m stuck thinking I need new oxygen sensors, I’m at 125k miles anyways and I have no record they have been replaced.

So is Bosch or Denso the OEM supplier for sensors? I’m thinking Bosch. I’m wanting to work with a shop and basically bring them sensor and let them do the engine drop.

Here are the part numbers I’ve come up with

Upstream
Cyl Part#
1-3 17330
4-5 17326
6-8 17328
9-10 17324

Downstream
Cyl Part#
1-3 16136
4-5 16136
6-8 16136
9-10 16893

These are all Bosch numbers.

Can any of these sensors be replaced without dropping the engine?

#2

As for 02s you will usually see a code for something if the 02s are bad or going bad. Starting with an 02 warm up code.

Whats the condition of your fuel filter as that’s the point where your fuel pressure is set. High rpm misfires are often going to be fuel related and if you changed your injectors I would look to the hpfp and lpfp system.

#3

Can you give some kind of walk through on how to pull the report from my ross tech software on something related to O2 health? I also want to look at my Long term fuel trims and see if that it weird in some way. because my only other guess is that I may have a vacuum leak somewhere.
As I’ve said before, the car will cruise down the interstate perfectly fine. Once I start to get into the throttle I can feel the car shaking like its misfiring and get no CEL codes.

Where is the fuel filter located on the car? and whats the best way to diagnose a bad HPFP?

#4

I would have to re check but I think block 001 is the instant fuel correction.

I think 033/032 is one of the other fuel blocks. But you have to check both ecus

#5

What do you think of that last line?

https://scontent-atl3-1.xx.fbcdn.net/v/t1.0-9/44510324_10213169350800877_9185753762633875456_o.jpg?_nc_cat=105&_nc_ht=scontent-atl3-1.xx&oh=3c035587bc0ba5bd39bf145345c03b34&oe=5C414A03

I tried sending this in a PM but I’m not sure if its sending.

#6

That last line says your car is running lean. by a good amount usually 5% one way or the other isn’t a big deal but your almost twice that at 10% keep in mind you have the other side of the motor to look at was well.

#7

How do I check the other bank? Is that under engine module 2-engine in vcds?

So lean is telling me there is a vac leak? Since the fuel trims are high and putting in extra fuel to compensate for the extra air?

#8

http://audirevolution.net/forum/index.php?topic=4598.msg125893#msg125893