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Various warning lights on dash but cannot find fault!

Antony Nov 4, 2018

  1. Antony

    Antony New Member

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    Hi and hope someone can help.

    I have had about 5 or 6 warning lights come up on the dash at the same time. These include handbrake failure, eps error, rear spoiler problem, headlight sensor problem, and some others...

    Originally the car was viewed by Audi dealer who diagnosed the fault as the Abs controll unit which under external warrantt was changed for a second hand unit elsewhere this cleared the issue for around 4 months which then returned.

    I then took it to a audi specialist who felt it should have a had a brand new Abs unit and coding but guess what.... its happened again!!!

    Please help on suggestions for what to do or try next either physically or contact wise.

    The car is an audi a7 2013 tdi not s line
     
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  3. RAF_S7

    RAF_S7 Well-Known Member Team V8 Gold Supporter Team Sepang Audi S7 A7 Owner Group Black Edition

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    These cars are electronically very complex, and as a result if there are any battery issues, it can cause a wide range of different, seemingly unrelated fault codes. Also one isolated fault can cause a cascade of different faults.

    Do you have access to VCDS to run a scan and see what the actual fault codes are? Some of the ones you describe can only be reset using a diagnostic tool like VCDS (Other tools are available)

    I would try and get a full scan of the fault codes if possible, and if nothing obvious shows, get an independent garage to run a battery test and see what the results are.
     
  4. Antony

    Antony New Member

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    Thanks for advice.I have had ine specialist amd one dealer look at it so would had hoped they checked the bat but cant be sure. I have got the report from the original time this happened from the breakdown recovery. (Attached)
     

    Attached Files:

  5. DarkyUK

    DarkyUK Active Member Team V6 Audi S5

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    As @RAF_S7 said, find someone nearby with VCDS, VCP or even get OBD11 and do a scan yourself. There are a lot of mentions about the ABS on the DTC's but also a brake sensor.
     
  6. Retroman

    Retroman Audi A3 2010 Sportback 2.0 TDI 170 (CBBB engine)

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    Given that we are making guesses on a forum, I would also put the battery under the spotlight of suspicion.
    1) We have had some cold nights over the past month or so and this significantly attacks a battery's strength - I've had to replace mine
    2) It's unlikely that several electronic systems develop a simultaneous fault
    3) ABS and stability type controls are the first to normally suffer if a battery is struggling to supply sufficient power
    I would check the battery condition and also whether it is the correct one for the car (assuming you are not the original owner) as battery application charts for these cars can be confusing and/or owners try to economise with under-power batteries. I would guess your correct size to be either 100 or 096 with at least 70ah and something like 670 cc ah or more - obviously you ned to check your handbook and application charts closely
     
  7. Antony

    Antony New Member

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    Really appreciate the replies. As I say two so called Audi specialists have bkth put it down to the Abs unit which has been replaced twice.
    So will check the battery out myself or get a full battery test done with the AA and also check the manual.

    Thanks Again
     
  8. Retroman

    Retroman Audi A3 2010 Sportback 2.0 TDI 170 (CBBB engine)

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    When I changed my battery recently, the lack of old battery power caused the electronic power steering and stability control lights to light up my dash like a Xmas tree. After driving about 20 metres (with new battery installed) they all went out.
     
  9. Antony

    Antony New Member

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    Oh wow. Well if this is the problem I will be asking for my 1200 quid refund
     

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