S8+ misfires on 5 cylinder
03-10-2022, 11:49 AM
#21
AudiWorld Super User
In fairness, I did get a solid CEL with the P2096 code. I guess I should get that sorted before doing anything crazy (shims, springs, plugs, etc.). A new sensor's price ranges wildly, is there any real benefit to purchasing the OEM Audi unit? After all the dealership installed a new one (same error code) about two years ago and here I am again.
03-10-2022, 12:49 PM
#22
AudiWorld Senior Member
If you are standing in front of the car looking at the engine bay, which side is considered BANK ONE? I have replaced O2 sensors before on other vehicles, but where exactly is this one located (post catalyst bank 1)?
Lastly, I always think of "bank one" as having cylinders 1-4 in it. Cylinders 5-8 are located in "bank two". Is this a correct assumption? If so, I'm not too optimistic about the P2096 code being related to the #5 issue since it is located in a different bank.
03-10-2022, 03:48 PM
#23
Super-Duper User
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C'mon Dave. You've been around here long enough to be as confused as the rest of us about that
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Looking at the engine with hood open, bank 1 is on the left, putting the O2 sensor on the cat on the right.
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Bank 1 is the bank that includes the #1 cylinder.
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C'mon Dave. You've been around here long enough to be as confused as the rest of us about that
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Looking at the engine with hood open, bank 1 is on the left, putting the O2 sensor on the cat on the right.
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Bank 1 is the bank that includes the #1 cylinder.
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03-10-2022, 04:27 PM
#24
AudiWorld Super User
I have never had this situation until the dyno pull...but had the APR Stage One Tune installed a couple of weeks prior to that. So APR installed and went for a month without a problem. Dyno and one occurrence of the flashing CEL, Three weeks later, same thing while accelerating mildly.
The spark plugs were replaced around 13K/miles ago and I filled up the tank last week at Buckeye's. PLEASE tell me I don't require shims and/or new valve springs! What else could it be?
Yep, I guess we will skip the seemingly on point TSB about the valve springs/shims that applies to S8+ and specifically a cylinder 5 error (in Bank 2)...let alone the tune.
And no, changing an O2 sensor on Bank 1 (1-4) is realistically not going to do squat on #5 or Bank 2.
P.S. Guessing any of your warranties have clocked out?
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Last edited by MP4.2+6.0; 03-10-2022 at 06:42 PM.
03-10-2022, 07:41 PM
#25
Super-Duper User
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Dave, dial back your tune to stock if you can, and run 93. See what happens. If it straightens out, suspect that the tune wasn't quite right for your engine operating parameters.
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Dave, dial back your tune to stock if you can, and run 93. See what happens. If it straightens out, suspect that the tune wasn't quite right for your engine operating parameters.
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DallasDave (03-11-2022)
03-11-2022, 06:52 AM
#26
AudiWorld Senior Member
Good advice, I will see if that is possible. I have four options with my current APR Tune: 91 octane, 93 octane, 100 octane and valet mode.
03-11-2022, 07:48 AM
#27
Super-Duper User
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It's possible if you have the APR tune. You use the cruise control stalk unless you have the optional interface.
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https://documents.goapr.com/dpp_emcs_instructions.pdf
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It's possible if you have the APR tune. You use the cruise control stalk unless you have the optional interface.
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https://documents.goapr.com/dpp_emcs_instructions.pdf
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Last edited by A8L_New_England; 03-11-2022 at 07:52 AM.
03-11-2022, 08:36 AM
#28
AudiWorld Senior Member
Yep, I have the BT dongle that plugs into the OBD2 port (so I can change the tune from my phone). I don't think the 91 octane tune is considered "stock" but I will give it a try later today.
03-11-2022, 11:46 AM
#29
AudiWorld Senior Member
So I set the tune to the 91 octane setting and still got the flashing CEL under moderate-to-heavy acceleration. I put things back to the 93 octane tune and launched it...no flashing CEL, lol. Very inconsistent obviously. What are the odds it is the fuel? Granted it happened during a dyno pull (on Costco 93) in the past, but it seems more common with the full tank of Buckee's 93. Thoughts?
03-11-2022, 04:37 PM
#30
Super-Duper User
Seems very strange that it flashes on the 91, but not on the 93! Why not try a tank of top tier like Sunoco or Exxon?
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It might be worth a call to APR; they are pretty knowledgeable and may have a suggestion we haven't thought of.
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Unfortunately, the fact your VCDS data pointed to cyl #5 isn't very reassuring.
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It might be worth a call to APR; they are pretty knowledgeable and may have a suggestion we haven't thought of.
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Unfortunately, the fact your VCDS data pointed to cyl #5 isn't very reassuring.
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