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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > Audi SUVs (Q7 & Q5) and other V6 TDIs

Audi SUVs (Q7 & Q5) and other V6 TDIs Discussions area for Audi Q7 and Q5 TDI (2009+ in Canada & the US) as well as others with the V6 TDI such as the A6, A7 and A8 sedans.

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Old March 16th, 2018, 21:33   #1
MEgearhead
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Default 3.0TDI GenII post Emissions Modification

Thought it might be interesting to start a thread on Post Emissions Modification observations.

We have a '15 Q7 TDI Prestige S-Line. It was an upgrade for our '09 they bought back. Had the fix completed in Feb. So far we have noticed the following (short list format, more info below):

All out performance is hardly changed.
More lag in the throttle response under certain conditions.
Mileage has dropped around 1 point so far.
Transmissions shift points are just plain weird.
Far more regenerations.

Overall, I'd say we still like it better than the non TDI's we tried, and it's not bad enough to wish we would have passed on the $9500 and the extended warranty. They gave us a '18 2.0T Q3 loaner while it was being "fixed", and I can't imagine a Q7 with a 2.0T. That would ruin the vehicle in my opinion. We also tried a new domestic SUV between the '09 and '15 which we came to loath enough to unload and buy the '15. If we were to have a regret it would be not keeping the '09 and the $11K for having it fixed, but we're still satisfied with the '15.

The more info:
It seems there might be a small decrease in WOT performance, but rough 0-60 times don't indicate that. My sons love doing 0-60 times and before and after are right around 8 sec's. (I know, I'm teaching them bad habits I will likely regret later since they are not driving age yet.) So, the difference is in the tolerance of a 12 yr old operating the stop watch.

The intermittent lag in throttle response is the most frustrating. It's similar to the VW B5.5's, only worse. Once in a while it decides to hesitate then it launches like it's been prodded. This is especially bad if you get on it right after letting off. (I know, I know, you shouldn't drive it that way, but sometimes in traffic you just have to.)

It will take a few more tanks to really determine mileage impact, but on two fills it seems to be around 1 point lower.

The change in shift points is hard to explain. Before it seemed the transmission always upshifted too soon and downshifted too late, but it was easy to get used to, and overcome with throttle angle. Now it seems to be a little shifty about shift timing. Sometimes it seems better, others it hangs way too long with a harsh shift, and others it jumps the shift. This is both in upshift and downshift. The rapid changes in throttle sometimes required in rush hour city driving seem to confuse it the most. It's not really bad; some may not even notice it. Having rebuilt and upgraded THM's for budget street rodders, I'm a little more perceptive to shift timing and quality.

Before the change we never really noticed a regeneration (in either the '09 or the '15). Now since the change at least five times after getting out it smelled very hot and the fan was running. I have not had a chance to look at the regeneration status with VCDS to know for sure, but it seems to me regens are being interrupted.

I'm very interested in what others have observed.
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Old March 17th, 2018, 06:34   #2
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^^ Nice, thorough report. You will find many more such reports in the Dieselgate section of this forum. Yours is consistent with the others, except for a few cars that experienced errors of some kind and a few owners who are apt to be angry and complain.
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Old March 17th, 2018, 15:31   #3
BarryT82
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I’ve noticed a lot of regenerations in both of my Q5’s. After a cold start it seems to idle high and burn a lot of DEF as well. I have a stage 2 tune on mine and my wife has the Chipwerke Pro on hers. After installing the tune it still warms up faster than it did before the fix and the transmission shifts as it did after the fix, but it’s not jerking like it did shifting from 2nd to 3rd. The fuel economy hasn’t increased with the Chipwerke module, but it’s increased significantly with the tune.
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Old March 27th, 2018, 07:52   #4
BigChiefS4
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I just bought a '14 Q5 TDI with 103K on the clock. Sometimes when I'm driving around and I stop, I smell burning rubber. Is that the regen process?

I also get two codes thrown on a regular basis, sometimes daily. Do either of these have anything to do with the regen?

U040F Invalid data received from reductant control module
P202C Reductant tank heater control circuit high.

I'm new to TDI's but so far I love this thing. I've put just over 10K on it and have yet to refill the AdBlue tank. Or, at least, I'm not getting any warnings to refill it.
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Old March 27th, 2018, 12:40   #5
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If your fan is running and the car is throwing heat when you stop, you had a regen underway. The car will attempt another and another until it is able to complete. That takes about 20 minutes when the car is going at a good clip.

The codes are for sure emissions related. Do you have a check engine light or not? I’d keep a record of the codes until one comes on.
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Old March 28th, 2018, 11:30   #6
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Yes, the CEL comes on. I have a Bluetooth OBD-II reader and an old Android phone with DashCommand on it. That is where I'm getting the codes from. I can read and then clear the codes with that app. I use it mostly to monitor my gas mileage.
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Old March 28th, 2018, 17:30   #7
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^^I’d bring it to Audi since they are required to fix any errors underlying those codes under the settlement extended warranty.
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2015 Q5 TDI w/ Chipwerke tuner, 43K Miles. Post fix MPG: 34.0
2015 Golf TDI SE, Lighting Package, 25K miles
2011 Touareg TDI (sold back, May 2018); 2015 Golf TDI S (totaled, Oct 2018)
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Old April 2nd, 2018, 04:27   #8
HMBJack
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2014 Q5 TDI. Had the emissions modification completed in February.

My main observation is the smell of rotten eggs (sulfur) at every start up. Goes away when the engine gets hot but it's there every time. You can smell it with windows up or down.

Anyone else smell this? Any solution? Thanks
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Old April 2nd, 2018, 07:28   #9
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It’s the DEF. It burns a lot more with the fix.
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Old June 5th, 2018, 14:13   #10
Tsch125
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Default Surging at low speeds under light throttle

Anyone notice a jerky surging in 1st-3rd gear (not a hard shift) at cold start under light throttle? Dealer tells me there’s nothing wrong, no fault codes, etc. They say this behavior is “inherent to the modification”, but I haven’t read anyone here experiencing the same problem. It frustrates me, to say the least.

Last edited by Tsch125; June 5th, 2018 at 15:35.
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Old June 5th, 2018, 14:45   #11
BigChiefS4
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Quote:
Originally Posted by Tsch125 View Post
Anyone notice a jerky surging in 1st-3rd gear (not a hard shift) at cold start under light acceleration? Dealer tells me there’s nothing wrong, no fault codes, etc. They say this behavior is “inherent to the modification”, but I haven’t read anyone here experiencing the same problem. It frustrates me, to say the least.
Yes, as I'm leaving the parking lot at work, it does that, but only for a short time. A block, at the very most.
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Old June 5th, 2018, 15:35   #12
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Quote:
Originally Posted by BigChiefS4 View Post
Yes, as I'm leaving the parking lot at work, it does that, but only for a short time. A block, at the very most.
Where was yours repaired? Had mine done at Audi St Paul in Maplewood. Less than impressed by the professionalism of multiple employees.
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Old June 5th, 2018, 15:44   #13
BigChiefS4
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Quote:
Originally Posted by Tsch125 View Post
Where was yours repaired? Had mine done at Audi St Paul in Maplewood. Less than impressed by the professionalism of multiple employees.
I purchased it from the same dealer, post-repair, on Valentine's Day. Traded in my 2010 Q5 3.2. Couldn't be happier.

The only dealer in town I won't ever go to is Carousel Audi. I've never had a bad experience at Maplewood.
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Old June 5th, 2018, 15:57   #14
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Bought mine at Audi Mpls Feb 2017 (formerly called Carousel). No issue with their sales dept.
Fix done at Maplewood, so only have experienced their service dept.
As far as I know, both are owned by Carousel Group.
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Old June 5th, 2018, 18:14   #15
BigChiefS4
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Quote:
Originally Posted by Tsch125 View Post
Bought mine at Audi Mpls Feb 2017 (formerly called Carousel). No issue with their sales dept.
Fix done at Maplewood, so only have experienced their service dept.
As far as I know, both are owned by Carousel Group.
Yeah, they're both owned by the same people, the Pohlad's. The service is MUCH better at Maplewood, IMHO. Richfield Audi is owned by someone completely different.
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