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D2 - Transmission Gearboxes, diffs, drive shafts. |
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Thread Tools | Display Modes |
#1
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Reverse Puts S8 Into Limp
Got a bit of an issue with my recently acquired 02 S8.
Whenever I put the car into reverse, I get a bit of a clunk, and all the transmission lights come on. The car then goes into some sort of limp mode in that power appears restricted, but will actually change through some forward gears, and does reverse without issue. Restarting the car immediately rectifies the problem, and all forward gears are extremely smooth. The problem was intermittent for a few days, but now appears to be happening every time I go into reverse. It's annoying, but I can live with it if it's no threat to the transmission as a whole. Ideas? |
#2
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Most likely the F125 range select switch, if there's nothing fundamentally wrong with the box. If it will set off fine in D and not play up until you next move the gear selector about then it's most likely that. It will show up with a fault code scan.
If you post where you're located somebody may be able to scan it with VCDS if you don't have it? Part itself is about £150 and it's on the side of the gearbox so bit of a ballache to get to, but not impossible
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#3
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Many thanks for the reply.
Yes, it does sound like it's that. I'm in Leeds if there's anyone around that might be able to help. Where would I source a F125? Having trouble, and I understand there are two types? |
#4
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There are 2 types (the plug is the difference) but TPS should be able to source you the right one based on VIN
http://www.thetradepartsspecialists.co.uk/
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#5
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f125 switch
Your symptoms definitely sound like the f125 switch is faulty. The switch lives on the passenger side of the gearbox and the connector can be accessed from below or by removing the passenger side wheel.
Have a look on audipages for how it is replaced. The writeup makes it sound easy...it really isnt. Absolute pita. The torx bolts that hold the switch in place can strip easily unless you use the right torx bit....T27.....and to get access to the bolt next to the exhaust I undone the bolts on the flange holding the exhaust in place to get a bit more movement and used a modified torx bit to get to the bolt. Not a nice job at all...good luck
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01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012 |
#6
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So, things took an awful turn for the worse yesterday.
Driving about at 10mph, when I got the dreaded bang and real difficulty selecting gears 1 and 2. After driving about for a min, I can get the car to light up the PRNS on the dash and go into limp mode. When it's in limp mode it drives about in what I'm assuming is 3rd, 4th and 5th perfectly well. Restart it and there's all manner of slippage. Now I'm almost certain that the thing is mechanically dead, but the really odd thing is that all of a sudden the tiptronic function that never worked on the dash before is doing exactly what it should, and I already knew from VCDS that I deffo had a F125 problem. There's no way this is all down to the F125 is there? |
#7
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Doesnt sound good at all. Best thing - even at this stage - is to try and get it to a ZF specialist (not sure where you are but there is a list of suitable places in the section on Transmission). At least you will get an opinion in whether it's terminal or not. Best of luck.
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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. |
#8
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When my F125 switch went, I had all sorts of issues. Initially, like yours, it was worse in reverse, but it eventually started not changing up and, although the PRNDS lights weren't on, it was definitely in limp mode (not good on the M8 in the rush hour!). But it often went away for a while on a restart.
As David says, get it to a ZF specialist PDQ!
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!). |
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