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D3 - Common Faults Quick links to all known common faults and their solutions

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  #1  
Old 2nd November 2016, 08:43 AM
woodpoleman woodpoleman is offline
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Default D3 Intermittent Start Fault

I have a 2005 D3 3.0 TDI Quattro with an intermittent fault since May. Car will start but sometimes there's a lag between turning the key and starter kicking in and when out and about after a couple of stops will not start. Turn the key hear relays clicking but starter does not engage. Leave it a while (can be 30 mins - 2 hours) it'll start again. My garage has replaced starter ecu, ignition switch, starter motor. I've replaced engine coolant sensor and starter relays. Audi re-coded ecu, replaced and coded new battery. Audi had the car for two weeks started 4/5 times each day but never drove it so fault never occurred. Any help and ideas will be gratefully received.
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Old 2nd November 2016, 08:55 AM
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M-A8 M-A8 is offline
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Can you post a full VCDS scan??
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Old 2nd November 2016, 12:09 PM
woodpoleman woodpoleman is offline
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Thanks for the reply but I don't have VCDS information. My garage uses a third party for in depth diagnostics who wants to extract all fault codes for subsequent analysis. Sorry I can't be clearer than that.
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Old 2nd November 2016, 12:55 PM
PsYcHe PsYcHe is offline
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Is it worse when it's been raining? My 2003 D3 had an issue with water ingress when I got it, which caused issues with starting.
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Old 2nd November 2016, 07:09 PM
Joe2.0E Joe2.0E is offline
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Could be as simple as an earth strap on the starter or even the battery.
When you say "replaced", are they new parts or from a breakers ?
Could be a suspect replacement part.
Before spending anymore on parts, it might be more prudent to get the car to a decent auto-electrician.
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Old 2nd November 2016, 10:33 PM
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Well, I would say get the full scan done by one of the local to you forum memeber (look in the vag com register thread) and post the results so we can have a look.
It looks like they may be using basic scanner where they cant see the whole scan so they just keep changing parts using the lottery strategy.
With A8s in most cases you need to look at the entire scan before making the call what to change first.
For example an ABS fault can be caused by a faulty steering angle sensor and I've seen people having ABS pumps changed.
Battery fault caused by faulty battery ECU so no need to change the battery just the module and so on.
One faulty component can trigger fault codes in few other components and if they have limited knowledge about A8s you will end up having all the parts changed but not the one which actually is causing the problem which could be the case here looking at the list of stuff you've had replaced.
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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  #7  
Old 6th November 2016, 07:19 PM
woodpoleman woodpoleman is offline
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Quote:
Originally Posted by woodpoleman View Post
I have a 2005 D3 3.0 TDI Quattro with an intermittent fault since May. Car will start but sometimes there's a lag between turning the key and starter kicking in and when out and about after a couple of stops will not start. Turn the key hear relays clicking but starter does not engage. Leave it a while (can be 30 mins - 2 hours) it'll start again. My garage has replaced starter ecu, ignition switch, starter motor. I've replaced engine coolant sensor and starter relays. Audi re-coded ecu, replaced and coded new battery. Audi had the car for two weeks started 4/5 times each day but never drove it so fault never occurred. Any help and ideas will be gratefully received.
Thanks to everyone for their interest and advice which has been appreciated. I'm getting a scan this week and will let you know how it goes.
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