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| D2 - Transmission Gearboxes, diffs, drive shafts. |
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#1
24th July 2018, 08:57 AM
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I drove my PF S8 from Dorchester to Exeter in limp mode before the car died completely! Subsequently I found out it wasn't the gearbox at all but the alternator had self destructed. I was running on the battery and below a set voltage the TCU gives up and shoves the box in limp mode.
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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#2
24th July 2018, 11:28 AM
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Similar experience to mine...
After having had a nose at the photo MJ posted, it reminded me of my gearbox woes which I've cunningly hidden in the Engine/Under the bonnet section here:
http://forum.a8parts.co.uk/showthread.php?t=7550 Your current situation as described seems to be very similar to mine - my A-drum has some of the top lip destroyed, which was discovered when it went to KSM in Carshalton, Surrey for a rebuild. I was able to select reverse no problem, and it went into limp-home mode aka thump mode upon selecting drive. The thread posted above contains plenty of pics. When my gearbox went 'bang', I drove it for 13 miles back home from Gatwick, and then 3 miles to Carshalton where it was going to be repaired. Auto gearbox man told me to take it steady and not rev it too much - seemed to be quite happy on the way back home. Traffic light starts were of a glacial pace, at best so I used my hazard warning lights to good effect. I hope it's not terminal for you - it was the enthusiastic and caring response on this very forum that persuaded me to spend the money and get it sorted. I'd have only possibly experienced the exact same issue if I were to have gone out and bought a replacement car of a similar age. Hope all goes well and keep us all posted.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend) 2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend) 
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#3
25th July 2018, 01:37 AM
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Very similar symptoms to mine, which was terminal I’m afraid.
Had to reverse onto the scrappers lorry because reverse worked fine... Still wish I’d repaired rather than scrapped though
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2002 Mark's D2 S8 FE 2020 BMW M340d xDrive (Anely's daily driver) 2000 FL D2 4.2 QS - SOLD 2011 
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#4
25th July 2018, 08:59 AM
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Right folks, error codes read and bringing up the one, 17114 (Incorrect Ratio).
Garage is recommending a fluid and filter change first, just in case. Discuss. I'm off to have a little cry.
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 2002 D2 S8 - Avus Silver, Valcona red leather, Dark Myrtle wood inserts, Heated rear seats, Heated windscreen, Auto dim rear view mirror, Bose, Xenon Plus, Servotronic, Extended leather, Heat & UV Reflective glass & Ski hatch. Gearbox went bang but she's sleeping safely away.
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#5
25th July 2018, 09:05 AM
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Well Ross-Tech says:
17114/P0730/001840 - Gear Ratio Monitoring: Incorrect Gear Ratio Possible Causes Transmission Fluid contaminated Transmission faulty (Mechanical Problem) Possible Solutions Check Transmission Fluid (Color and Contamination) Replace Transmission Fluid when necessary Check Transmission Mechanics Given that a rebuild (if required) is going to cost a fair bit is it worth "trying" a filter/fluid change? That is also not cheap but..... Does your garage have the capability of removing the gearbox for shipping to a repairer or will the whole car need taking there?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#6
25th July 2018, 09:40 AM
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IMO an oil change is a bit of a waste of money at this point, given that reverse works. The best it can do is give a vague indication of what's wrong by the condition of the old oil, but equally it may not tell you anything.
If you want, they could get an oil sample by pulling the small drain plug in the sump. You can remove that plug, get a sample of oil, and put the plug back easily without losing enough to make a difference. Dip some white paper in to the sample to get a good look at it. The oil should be a grey-yellow colour, should smell slightly fishy, and should be clear with no suspended debris. Whatever it comes out like, there's no point changing it because its either perfectly ok, indicating a mechanical problem, or its not ok, indicating a different mechanical problem  If the oil is contaminated, the only way to flush it fully is with a specialist machine. Changing whats in the sump will only get about half of it so won't make much difference.Tbh all the garage can do at this point is narrow down potential failures, which doesn't help you at all since it'll have to go to Mackies anyway.
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#7
25th July 2018, 11:00 AM
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Quote from my original blown gearbox thread....
Quote from my original blown gearbox thread, as mentioned previously:
"I've just spoken to a chap based on a recommendation from the garage which looks after my A8L. He said he'd take my money all day long with regard to my request for a fluid change - he said it would be a waste of money." I'd save your money and put it towards what looks like an inevitable rebuild. That's exactly what I did under similar circumstances. MJ's advice is, as always, golden.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend) 2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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