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#1
10th August 2010, 06:32 PM
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Second opinion wanted on transmission woes
After 14 month's respite from the previous gearbox troubles I had on my '97 4.2QS, they are back with a vengence. Struggled to get the car home in limp mode on Sunday evening as even the slightest gradient caused it to almost grind to a halt. Pressing the throttle resulted in no movement just over-revving, and the cogs won't change up to 4th/5th. The CAT light is also lit up permanently. I had the fluid/filter etc changed in June last year and this seemed to cure a similar problem back then. Could the same issue have returned after only a year? (< 20K miles since then). Or has my torque converter finally packed in? Difference this time is that the engine just revs in 3rd (I think) whereas last time it still went in to 4th/5th even in limp mode. Here are the codes :-
17118 P0734 Gear 4 - incorrect ratio 17119 P0735 Gear 5 - incorrect ratio 17114 P0730 Gear Ratio Control - incorrect ratio 17087 P0703 Torque converter/Brake Switch B Circuit - Malfunction Could a fault in the F125 switch generate the P0730 and P0703 codes? Any advice welcome - at my wits end with this gearbox and car's fate hangs in the balance as its going in for another fluid & filter change this Wednesday.......a real shame about the transmission on A8's as in all other respects they are fantastic cars. Must be dozens of otherwise sound cars scrapped each year just because Audi never recommended regular maintenance on these boxes.... 
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#2
10th August 2010, 07:55 PM
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I'd look at a rebuild.
You in Scotlandshire? Mackies in Glasgow are a proper ZF shop, or A4audi if you just want it looked at.
__________________
2010 Jag XF 3.0D Portfolio S I know.. I know.. 
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#3
10th August 2010, 08:48 PM
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Yep Stirlingshire to be exact! I've been in touch with Mackies before on other matters but TBH I'm not in the market for a full re-build....if the fluid & filter change doesn't help, I fear its curtains for the old gal unless another (less expensive) solution is identified. Am willing to chance £200 on another fluid & filter swap but £1500 for a rebuild is not an option (more than the car's worth for a start). Even if I can get another 12 months out of her it would be worth it. For the moment I'm being optimistic, I'll find out the position in the next day or two. Fingers crosses but in the meantime I'm hoping for the best but fearing the worst!
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#4
10th August 2010, 08:57 PM
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Sad sad news,
IMO, if its hitting limp mode in 3rd, then fluid and filter change isnt going to do much, its a bit like changing the engine oil when the engine has already seized - fluid and filter is preventive maintenance, not a fix it solution...
__________________
For parts enquiries and Forum User Administration please contact customer services directly, not me  - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones. The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff...... The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous..... The First 20 Audis: 2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey, 2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue, 2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue, 2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey, 2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6, The Second 20 Audis: 2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue, 2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black  , 2007 TT Roadster, 2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black, 2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi) 2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black Most Recent Audis: 2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8 Everything Else 1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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#5
10th August 2010, 09:20 PM
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Thanks yes you are probably right, will let you know how it goes anyway. The box was going in to limp when trying (and failing) to engage 4th gear. Last time it took a few days after the filter/fluid swap before the box returned to 'normal' (plus a further top up of 1 litre ATF). Think this time its more serious though.....but will keep you posted if Lazarus rises from the dead!
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#6
11th August 2010, 05:36 AM
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I think Ians right - as someone who has just changed his box it sounds like youve lost a clutch basket so youre not getting past 3rd gear. . . sorry to hear
__________________
Confidence is the feeling you have before you know better . . . . Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#7
11th August 2010, 05:55 AM
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Just a thought -any chance these symptoms and fault codes could be caused by a faulty F125 switch???
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#8
11th August 2010, 07:29 AM
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You mention 5th gear, and 1997 which makes this one of the 'deadly DTD' type gearboxes, the first of the 5 speed quattros.....
You dont mention your mileage, but if its anything like 125000 + then statistically its likely the box is dead. Any garage that takes your money for a fluid change at this point is just robbing you tbh....
__________________
For parts enquiries and Forum User Administration please contact customer services directly, not me - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones. The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff...... The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous..... The First 20 Audis: 2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey, 2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue, 2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue, 2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey, 2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6, The Second 20 Audis: 2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue, 2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black , 2007 TT Roadster, 2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black, 2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi) 2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black Most Recent Audis: 2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8 Everything Else 1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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#9
11th August 2010, 02:31 PM
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From Ross Tech Wiki if this helps -
17118/P0734 - Gear 4: Incorrect Ratio Possible Causes Wiring and/or connections faulty Sensor Gear Position Indicator faulty Gear Solenoides faulty Mechanical failure Possible Solutions Check wiring and connections Check Sensor Gear Position Indicator Check Gear Solenoides 17119/P0735/001845 - Gear 5: Incorrect Ratio Possible Symptoms Clutch Slipping Reduced Power Output Possible Causes Gear related Clutch slipping/faulty Gear related Solenoid Valve dirty/faulty Overloaded Clutch due to continuous high Torque or Tuning Wiring and/or Connections faulty Sensor Gear Position Indicator faulty Mechanical Failure Possible Solutions Check Engine Values for Plausibility, especially Torque related ones. Check Wiring and Connections Check Sensor Gear Position Indicator Check Gear Solenoides Special Notes The gear monitoring of the transmission control module checks the gear ratio by comparing transmission input and output speed in regard of the currently selected gear. This fault code is being set when recognizing an implausible transmission ratio. 17114/P0730/001840 - Gear Ratio Monitoring: Incorrect Gear Ratio Possible Symptoms Malfunction Indicator Light (MIL) ON 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 Special Notes Transmission Damage may be caused by Engine Problems, make sure there are no other/relevant Fault Codes stored in Engine Control Module. 17087/P0703/001795 - Brake Switch (F): Electrical Malfunction Possible Symptoms Malfunction Indicator Light (MIL) ON Possible Causes Wiring and/or Connector(s) from/to Brake Switch (F) faulty Brake Switch (F) faulty Possible Solutions Check Wiring and/or Connector(s) from/to Brake Switch (F) Check/Replace Brake Switch (F) Special Notes When found in Vehicles with Drive-by-Cable (DBC) the Brake Switch (F) is connected to the Transmission Control Module. On older Models this Code is stored automatically after Terminal 15/Ignition is switched ON. If the Brake Switch (F) is OK you can avoid this Fault Code by pressing the Brake Pedal after switching on the Ignition and prior to checking Fault Codes. The Code should automatically be cleared then. When found in Vehicles with Drive-by-Wire (DBW) the Brake Switch (F) is connected to the Engine Control Module In this case you should check the Engine Control Module for Fault Codes as well and the Data Bus Wiring between Engine and Transmission Control Module.
__________________
Confidence is the feeling you have before you know better . . . . Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs Last edited by Architex_mA8tey; 11th August 2010 at 02:34 PM.
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#10
11th August 2010, 08:53 PM
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Bad news.....
As feared the gearbox is toast. I've decided to cut my losses and call it a day, so if anyone is in the market for a 1997 4.2 QS (pre FL) with 149K on the clock for spares or repair I'm open to offers (collection only!!). Car is in excellent condition for year bar the knackered gearbox (pics available).
Gutted at this outcome but c'est la vie.....if someone is willing to either take on a project or spend £1500 on a gearbox overhaul then they will have themselves a great car. Otherwise its up for spares/breaking. 
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Linear Mode
