13 S6 P2096 & P2196 Codes

[maxeffect]

I am getting codes P2096 & P2196. And the dealer is trying to blame the Milltek cat-back and the RS7 airbox + intake tubes. I think there is an exhaust leak or faulty O2 sensor.

Am I missing something? There is no MAF on the 4.0 TT, so it can't be oil contamination on the sensor. The airbox is properly sealed & no obvious vacuum leaks.

Thanks

[pez81]

I'm sure dasquerade had the same faults and it turned out to be a leak. Check the exhaust see if there's some leak

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[Dasquade]

I'm not 100% sure about the code if that was the same (and only had it once, but did had powercuts under midload).
It ended up beeing the bolts between the downpipes and milltek exhaust that came loose (milltek uses thick flex joints and those make it pretty hard to tighten the exhaust bolts. It ain't an excuse and one should always recheck them after a few drives after installing...
I would check those bolts just to be sure (and check good!)....
Good luck :)

[maxeffect]

Thank you, I will look into the exhaust. It's only been on for about 2k. So it may need to be re tightened.

[pez81]

Thank you, I will look into the exhaust. It's only been on for about 2k. So it may need to be re tightened.

Bet it's that

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[Sanjman]

Hey Max ever figure this one out? Shop replaced the easy o2 sensors it seems. Should have been more attentive when they did the work but the issue came back.

I am getting codes P2096 & P2196. And the dealer is trying to blame the Milltek cat-back and the RS7 airbox + intake tubes. I think there is an exhaust leak or faulty O2 sensor.

Am I missing something? There is no MAF on the 4.0 TT, so it can't be oil contamination on the sensor. The airbox is properly sealed & no obvious vacuum leaks.

Thanks

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[wwhan]

Hey Max ever figure this one out? Shop replaced the easy o2 sensors it seems. Should have been more attentive when they did the work but the issue came back.

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Could be an exhaust leak. Is the cat running too hot?

P209600 Post Catalyst Fuel Trim System Bank1 Too Lean
P219600 O2 Sensor Signal Stuck Rich Bank 1 Sensor 1

Apparently there were some of 2013-2016 4.0T secondary O2 sensors with early failure, due to slow (rise /fall) response acording to this TSB: DTC for oxygen sensor after catalytic converter (P013E00, P014A00)

The ECU needs to see the proper secondary O2 sensors switching reponse relative to injector trim.

The primary O2 sensors, before the catalytic converters are Bosch LSU-4.9 wideband lambda O2 sensors.

The secondary O2 sensors used in the Audi 4.0T post catalytic converter O2 sensors (sensor2) are; Bosch LSF-4.2 The planar switching-type lambda sensor (with integrated central heater) generates a signal during the transition from lean to rich or rich to lean operation. Light-off time less than 12 sec.

Bank1,Cylinder 1,2,3,4; Bosch_0 258 010 528_Audi_4H0-906-262-L
Bank2, Cylinder 5,6,7,8; Bosch_0258-010-530_Audi_4H0-906-262-M

Nice article about testing lambda switching O2 sensors: Automotive O2 Oxygen Sensor Testing Procedures

Bosch Tips Faulty O2

[2018D4SXSE]

Oxygen sensors won't code for a leak downstream of the oxygen sensor. It only monitors before and after catalytic converter. From your post it seems you only did a catback system, if you didnt touch downpipes, it's probably just faulty sensors. They usually start to throw heater or slow response codes around 60K miles

If you have access to a smoke machine that is the easiest way to find a leak if there is one upstream of the sensors

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[maxeffect]

Had the same errors right after my Milltek exhaust was installed, within the first 100 miles. I took it back to the dealer (I had them install the exhaust) they just tightened up the clamps and reset the codes. They have not come back. Good luck.

[ItsLarryG]

I had a P2096 code for a couple days, when I filled up my fuel tank again it instantly went away. Have you refueled since getting the codes?

[Sanjman]

So I'm confident my issue is that they changed the wrong O2 sensors.

I also just ordered the wrong O2 sensors.

Will provide quick write up and I clear this up.



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[b8_Jeff]

So I'm confident my issue is that they changed the wrong O2 sensors.

I also just ordered the wrong O2 sensors.

Will provide quick write up and I clear this up.



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Anyone have updates on these issues? I threw some codes for lean and rich readings... car seems to be running fine but a small hiccup at idle sometimes... ill try and post pictures

[b8_Jeff]

I actually have both those exact codes... can't figure out how to post VCDS pictures lol stock S6, but ive only had the car for about 3 weeks... currently 50k miles.

[Sanjman]

I actually have both those exact codes... can't figure out how to post VCDS pictures lol stock S6, but ive only had the car for about 3 weeks... currently 50k miles.

My issue was the O2 sensor, the shop replaced the wrong side... i replaced the o2 sensor on the passenger side and all is well (the exhaust criss crosses).