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#1
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RS6 Gearbox - No reverse
Hi there,
i was chatting to a helpful mechanic at the local garage and he said he was looking at my gearbox (A8 4.2 D3) as it was the same/similar to an RS6 he was having a problem. He said that forwards was fine, but no reverse gear, which sounds a little odd when i've experienced limp mode with the ZF gearboxes. He seemed a little stuck with some of the local gearbox places not being interested, so i said i'd do some digging. Irritatingly i've not got the model and year on me, but i'm guessing someone here at least knows the odd pointer. Based Peterborough/Cambridge area thanks, Lee
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Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell) |
#2
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Quote:
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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 |
#3
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I think i'm going to go see if I can get a VCDS scan as It would surprise me if a small village garage has VCDS etc
From a quick look the F125 switch shows as an error code?
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Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell) |
#4
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The F125 switch in itself is a very dumb mechanical unit so doesn't give any error information at all, but the ECUs take information from its state and do record errors as a result.
The common "early warning" would be the 01119 - Gear Recognition Signal error.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 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". (A much rarer model than a D2 S8 by the way!) 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. AgateGrey/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, Auto-dim mirror, Leather, 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! |
#5
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...and for some reason the switch seems to "react" to selecting reverse as if the change of the electromechanical contacts in passing between forward and reverse positions triggers the fault or, in some cases, "cures" it.
As HP says "Gear recognition signal" fault code is the usual indicator.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. |
#6
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Just nipped down the garage to pass on Chester Autos number, but whilst there I had my VCDS in the car and did a scan.
It's a 1999 model with 98,500miles It goes forward not problems, drives great. Reverse gear selects on the dash and no limp mode or error flags.....It just doesn't move backwards! Apparently when it's really warm after a long journey etc it will slowly move backwards VCDS shows nothing on the auto trans. Engine had a couple of lambda b1,s1 errors and voltage too low....a couple of errors on level, locks and headlight range....which since it probably hasn't been read in a while could well be old and it did have a low battery.
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Current : 2005 A8 Sport 4.2 V8 D3 - LPG working! Previous : 1998 S8 PF 4.2 V8 D2 - Gearbox died ~120k 2002 S8 FL 4.2 40v V8 D2 Prins LPG - Engine valves met pistons ~230K Also : 1996 Jeep Grand Cherokee 4.0l (Post Apocalyptic makeover) 2003 Brabus Smart FourTwo (should sell) 2003 Mazda Rx8 2.3 (might sell) |
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