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D2 - Transmission Gearboxes, diffs, drive shafts.

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Old 17th October 2016, 08:26 AM
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Default Aaargh - PRNDS!

After many posts re-iterating John at Mackies of Glasgow statements about how the 5HP24 box is a perfectly OK bit of kit, i arrived back home last night from Audi Driver International having driven some 1000miles in 3 days without having skipped a beat. However, went to reverse out this morning to go for a swim and it went into PRNDS . If I stop and restart it works perfectly OK in Drive and Sport (but not tipronic) UNTIL I select reverse when it goes into limp mode. I am about to get VCDS on it after a pint of coffee but I am hoping its just the F125 switch (please!). The box was serviced Aug 2014 at 97k and its now at 109k.
Any suggestions/recommendations?
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Old 17th October 2016, 08:38 AM
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Mine started to do that a few months ago, most mornings when I reversed out of the garage. I was about to do a scan with the VCDS when it just went away! Hasn't played up for months now.
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Old 17th October 2016, 08:59 AM
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If it's otherwise working fine it should just be the switch - it's not that bad a job to swap but the box ideally needs lowering.

There's 2 types depending on wiring so if it is that either order from tps or leave to the garage fitting it, to avoid getting the wrong one
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Old 17th October 2016, 09:31 AM
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Quote:
Originally Posted by Adrian E View Post
If it's otherwise working fine it should just be the switch - it's not that bad a job to swap but the box ideally needs lowering.

There's 2 types depending on wiring so if it is that either order from tps or leave to the garage fitting it, to avoid getting the wrong one
I hope it is just theswitch. Will get out there when it stops raining! thanks for the warning about the types. Having just cocked up with lower control arms I'll do some research!
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Old 17th October 2016, 09:34 AM
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My guess would be the F125 switch plug contacts. My car has done that a few times in the past, especially as the colder weather approached. Disconnecting the plug and cleaning the contacts usually fixes it for another year or two.
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Old 17th October 2016, 11:08 AM
tintin tintin is offline
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In my experience it can throw this message once in a blue moon, and then not appear again...hopefully yours will do the same.

Sometimes I think these cars really do have a personality though - maybe yours was reacting to the unexpectedly long drive to Englandshire and back....
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Old 17th October 2016, 11:08 AM
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VCDS scan shows:

1 Fault found:
17090 - Transmission Range Sensor (F125)
P0706 - 35 - 00- Implausible Signal

So it seems like it is the F125 switch. And, as the lower control arms need renewing and the switch is in that area, they might as well be done at the same time. The Audiforum guide on the process shows it is a DIY fix but I am not sure that some of the fiddly work involved is best (safely) achieved on jacks/wheel ramps.
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Old 17th October 2016, 11:48 AM
HPsauce HPsauce is offline
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Same as me and I plan to get the F125 switch replaced sometime.
Adrian_E had it done a while ago and I think he got a garage to do it as the gearbox needs dropping a bit to get access.
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Old 17th October 2016, 12:43 PM
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Quote:
Originally Posted by tintin View Post
In my experience it can throw this message once in a blue moon, and then not appear again...hopefully yours will do the same.

Sometimes I think these cars really do have a personality though - maybe yours was reacting to the unexpectedly long drive to Englandshire and back....
They do need a damn good thrashing every now and again! Maybe it took the hump

My aged parents whom I was taking back up to Scotlandshire didnt even notice we doing 90ish. Just commented on the smooth ride and handling and lack of noise in the back.
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Old 17th October 2016, 01:12 PM
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Take care David, it can get a little more noisy in the back above the 90-ish kph that you reported doing. Wouldn't want the parents to experience any discomfort!
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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).
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