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Ad blue system fault no restart

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October 28, 2025Oct 28

Hi there I've a6c7 ultra engine code ddda recently I've got this yellow warning on dashboard so I've scanned for engine faults no luck i did some research i did top ad blue tank reset the scr tank level and the scr lock the I've checked the pressure ad blue 5 bar did some tests with ad blue injector tried to do inducemennt system reset no luck at all I did some dpf regeneration no luck also I've checked the nox sensor upstream and downstream and I've got some results upstream it seems to be fine but downstream it's showing on system not installed so I'm wondering if that could be issue with warning

Any thoughts thank you in advance

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C5 RS6 034 strut top mount
Audi A6 (C5) Forum

C5 RS6 034 strut top mount

petec5 · 9 hours ago9 hr

Hello all After a year of owning my first RS6 c5. It seems I'm in need of new strut top mounts. Do any of you have experience of the 034 rubber mounts? I've seen they are solid vs original ones that have bearings. How much of a difference does this make. And on a side note has anyone used RB Racing brake disc. What's your thoughts? Any help will be much appreciated Pete
- 2 replies
- 37 views
petec5

9 hours ago9 hr

petec5

3 minutes ago3 min
Are S5's notorious for not being serviced?
New Members Introductions

Are S5's notorious for not being serviced?

ZeroX · Saturday at 10:46 AM5 days

Hi, following on from my previous thread, I have seen another car that I was interested in: https://www.evanshalshaw.com/search/details/used/audi/a5/automatic-petrol-white-coupe/06ce9494-f94d-f111-8fdd-000d3a874790/ When I enquired with the dealer, they said there is only one stamp in the book from February of this year, and no history at all in the Audi database. So there is only evidence of 1 service in almost 10 years. I am starting to get a bit !Removed! off with this actually, and it's real
- 20 replies
- 433 views
ZeroX

Saturday at 10:46 AM5 days

ZeroX

37 minutes ago37 min
Help with some issues
Audi A5 Club

s5 coupe
Help with some issues

Kian · May 27May 27

Hello everyone, Wondering if anyone can help me. A few weeks ago my EPC light came on and immediately went into limp mode and started jumping when driving at 5mph. After a few hours I came back to the car and it was fine so I drove it to my storage unit. I came back the next day and when starting it the EPC light and EML light were illuminated and the idle was quite rough. I came back to it about a week ago and all the doors were locked, the key isn't unlocking it and the barrel of the central
- 5 replies
- 227 views
Kian

May 27May 27

cliffcoggin

1 hour ago1 hr
Wing mirrors don't fold out when unlocking the car.
Audi Q2 Club

Wing mirrors don't fold out when unlocking the car.

john260164 · 3 hours ago3 hr

Hi. My partner's recently bought Q2 has an odd and not very welcome feature. The wing mirrors fold on locking the car with the key pilp, but don't unfold when the car is unlocked with the plip. They only do so when the key goes in the ignition. In some circumstances this can lead to doubt about whether the doors are locked or not whereas before it was obvious as the plip alone folded and unfolded the wing mirrors (as is does with my similarly new A3). The garage says it can't be changed but does
- 2 replies
- 58 views
john260164

3 hours ago3 hr

john260164

2 hours ago2 hr
Park My A3 without having brakes on
Audi A3 (8Y) Forum

Park My A3 without having brakes on

JGB · 8 hours ago8 hr

Hi all I have had my A3 since September 2025 and I haven't yet been able to figure how to park it in my garage with the brakes off. It's an auto and I have read lots of stuff but I cannot figure it out. I may be stupid but there you go any helpful advice will be appreciated. JB
- 2 replies
- 77 views
JGB

8 hours ago8 hr

joe6

2 hours ago2 hr
A3 uncommanded engine shutdown
Audi Technical

A3 uncommanded engine shutdown

Bobs dad · 7 hours ago7 hr

I have a new A3 Black Edition auto. Within four weeks of delivery the engine cut out whilst driving, the drivetrain under positive power. The car rolled to a complete halt, the retardation entirely commensurate with the wheels driving a dead engine - it did not freewheel. The instrument panel remained powered and displayed no warning lights or fault messages. I shut the car down and after a pause restarted. Since then it has operated normally. The Distributor has found no data supporting t
- 1 reply
- 62 views
Bobs dad

7 hours ago7 hr

cliffcoggin

3 hours ago3 hr
Audi A1 coil packs
Audi A1 Club

Audi A1 coil packs

Andy baggy · May 21May 21

Recently while driving my EPC light came on . Followed by my engine management light. Unfortunately I was on the motorway so put car into sports mode in the auto box to keep the revs high so I could get home the 49 miles. Been to the garage this morning no lights on my dash they diagnosed 2 coil packs going down. They are going to replace all 4 spark plugs and coil packs next week. They also said that I may now need a new catalytic converter. Has anyone had any issues with this sort of proble
- 1 reply
- 180 views
Andy baggy

May 21May 21

Steve Q

3 hours ago3 hr
Central locking
Audi A3 (8P) Forum

Central locking

BlueBird · 10 hours ago10 hr

My passenger door only unlocks during summer months, back door same side, intermittent during winter. Is there an explanation please?
- 1 reply
- 53 views
BlueBird

10 hours ago10 hr

cliffcoggin

3 hours ago3 hr
GEARBOX MALFUNCTION YOU CAN CONTINUE DRIVING
Audi A6 (C7) Forum

GEARBOX MALFUNCTION YOU CAN CONTINUE DRIVING

Fcam_96 · Monday at 08:04 PM2 days

Hi, so I’ve had my audi a6 just over a year now cars been brilliant tbh drives perfect, on Saturday I did a 350 mile round trip to London and back in one day no issues at all that’s probably the longest drive I’ve done in the car, today I was driving back from work I got a message on my dash saying gearbox malfunction, I scanned the car and it gave me these three codes P084000 Transmission Fluid Pressure Sensor/Switch A P177500 Hydraulic pressure sensor 1 Adaptation at limit P060B00 Internal C
- 1 reply
- 113 views
Fcam_96

Monday at 08:04 PM2 days

Steve Q

3 hours ago3 hr
A% front suspension groan
Audi A5 Club

A% front suspension groan

IainH · 3 hours ago3 hr

Last summer while in the heat of southern France, my A5 (Dec-2017, 40,000 mile) developed a front suspension creak. It was always at low speed and particularly when turning left. The car was completely checked on my return, 'shaked, rattled and rolled', but steadfastly refused to creak once, however, everything was checked, levered, put in a shaking plate, and no creaks or movement in joints found, and so while noisy, the car was declared 'good' (safe). The sound is very like the creak heard her
- 1 reply
- 28 views
IainH

3 hours ago3 hr

spartacus 68

3 hours ago3 hr
Any ideas on what this sound could be? Audi A3 8P
Audi A3 (8P) Forum

Any ideas on what this sound could be? Audi A3 8P

Lewbyleww · 9 hours ago9 hr

Hi all does anyone have any idea on what this distinct tapping noise could be? had the rocker arms, lifters, injectors and all cam followers replaced and is still present. Noise is at idle and speeds up with acceleration and can hear it inside doesn't affect performance. Been advised by three separate mechanics its not bottom end so at my wits end really, any thoughts appreciated. Thanks a7bcf128-5947-4002-afba-29c811dd5d88 (1).mp4
- 0 replies
- 86 views
Lewbyleww

9 hours ago9 hr

Lewbyleww

9 hours ago9 hr
Does anyone know what this high pitched noise is?
Audi A1 Club

Does anyone know what this high pitched noise is?

redaudi20 · December 11, 2025Dec 11

IMG_2335.MOV Hi there, My A1 1.6 TDI Sport 2017 makes this high pitched noise which sounds like it’s coming from the right rear side. It more tends to happen when the weather is cold. It starts when the car has been going for a couple miles and stops as soon as you turn the engine off. I have attached a video of the noise. Does anyone know what this could be? Thanks IMG_2335.MOV
- 3 replies
- 704 views
redaudi20

December 11, 2025Dec 11

StanH

10 hours ago10 hr
Alternator failure related to mild hybrid system?
Audi A7 Club

Alternator failure related to mild hybrid system?

PocketsAintEmptyCuh · October 16, 20232 yr

I've been seeing more and more posts across FB and multiple forums about people having the alternator failure related to the 48v mild hybrid system and wanted to see if anyone has had this issue and how their experience has been. I know in USA they have announced a TSB with an extended warranty for 7 years but I am trying to get more info from Audi UK but not getting anywhere. Has anyone had this issue and if so has Audi fixed it (if out of warranty)? It seems to be tha
- 664 replies
- 213,097 views
PocketsAintEmptyCuh

October 16, 20232 yr

PeterWJames

10 hours ago10 hr
A6 2018 C8 3.0tdi quattro drivers mirror indicator
Audi A6 (C7) Forum

A6 2018 C8 3.0tdi quattro drivers mirror indicator

Steve320cd · Saturday at 02:12 PM5 days

Hi all, was on le shuttle yesterday coming home when I noticed my drivers mirror indicator must have had a stone hit it and broken an inch off, no damage to the mirror. Has anyone replaced one? Is it an easy job and where to get a replacement that is the correct whiteness without paying main dealer price? Tia
- 3 replies
- 166 views
Steve320cd

Saturday at 02:12 PM5 days

Tigger

11 hours ago11 hr
S-Line suspension change
Audi A3 (8Y) Forum

S-Line suspension change

lbr1978 · May 17May 17

Hi all Looking for some advice on changing out the rather firm and jittery S-line suspension on my 2024 A3 8Y (black edition) to something more comfortable and softer (possibly akin to standard SE suspension or equivalent). Any suggestions on what I should be considering and looking at for daily driving only please? I’ve heard Bilstein (B4s ?) and maybe the eibach pro springs would help make things more comfortable? thoughts and suggestions much appreciated. Any real world experience of changing
- 3 replies
- 309 views
lbr1978

May 17May 17

Steve Q

13 hours ago13 hr

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Ad blue system fault no restart

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Topics

C5 RS6 034 strut top mount

Are S5's notorious for not being serviced?

Help with some issues

Wing mirrors don't fold out when unlocking the car.

Park My A3 without having brakes on

A3 uncommanded engine shutdown

Audi A1 coil packs

Central locking

GEARBOX MALFUNCTION YOU CAN CONTINUE DRIVING

A% front suspension groan

Any ideas on what this sound could be? Audi A3 8P

Does anyone know what this high pitched noise is?

Alternator failure related to mild hybrid system?

A6 2018 C8 3.0tdi quattro drivers mirror indicator

S-Line suspension change

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