Starter Motor failure

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Tue Jul 23, 2024 2:53 pm

They are so crap. I'm 90% sure that's my problem too. This one has probably done less than 2000 miles. I'm going to install my Aliexpress special. Seriously, it can't be worse than the OE one.

I'll trace the wiring tomorrow for my peace of mind and to confirm F125. I'm internally shuddering at the thought of going through an F125 replacement again.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

User avatar
skyegtb
3rd Gear
Posts: 319
Joined: Thu Sep 04, 2008 6:37 am

Re: Starter Motor failure

Post by skyegtb » Tue Jul 23, 2024 2:58 pm

Well, the aliexpress one I fitted (which if I remember cost under £20) to fix this problem almost 5 years ago is still working 100% perfectly. The Audi genuine parts failed 3 x and were nearer £200 each time. I bought 3 of the aliexpress ones and glad I did, but quite honestly think they are miles better than the genuine ones.
2003 RS6 MTM 568

User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Tue Jul 23, 2024 3:06 pm

Great. Now I've broken my windscreen.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

User avatar
skyegtb
3rd Gear
Posts: 319
Joined: Thu Sep 04, 2008 6:37 am

Re: Starter Motor failure

Post by skyegtb » Tue Jul 23, 2024 3:08 pm

Shoppinit wrote:
Tue Jul 23, 2024 3:06 pm
Great. Now I've broken my windscreen.
Nightmare..... How?
2003 RS6 MTM 568

User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Tue Jul 23, 2024 3:10 pm

Trying to put the mirror back on. Hope they are still available. So angry with myself.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

User avatar
skyegtb
3rd Gear
Posts: 319
Joined: Thu Sep 04, 2008 6:37 am

Re: Starter Motor failure

Post by skyegtb » Tue Jul 23, 2024 3:13 pm

Sickener. I am still on the original screen as fitted from factory and am dreading the day it gets damaged.... Pretty sure they are still available, I think you can check on sites like Autoglass etc. Not sure it would be a genuine Audi one you would get though, if thats what you meant
2003 RS6 MTM 568

User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Tue Jul 23, 2024 3:22 pm

Yeah, mine is the original screen, too. I'll miss that anti-UV coating.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

srichards
4th Gear
Posts: 769
Joined: Sun Oct 18, 2015 12:39 am

Re: Starter Motor failure

Post by srichards » Tue Jul 23, 2024 3:33 pm

Shoppinit wrote:
Tue Jul 23, 2024 3:06 pm
Great. Now I've broken my windscreen.
Bums. It's not going well today is it? Hopefully one of the windscreen people will still have one.

I wonder if there are any after market anti UV coatings available if the replacement screens don't have them?

User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Thu Jul 25, 2024 12:15 pm

Right, fault traced to the F125 (shocker). I'll try to post up a diagnostics thread on how to get positive confirmation of this. I'm also gonna keep a length of wire in the car for emergency hotwiring if necessary. That'll teach me for not replacing it as soon as it started to play up.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

User avatar
skyegtb
3rd Gear
Posts: 319
Joined: Thu Sep 04, 2008 6:37 am

Re: Starter Motor failure

Post by skyegtb » Thu Jul 25, 2024 12:33 pm

When I had my no start issue, and the F125 code finally appeared I did a full diagnostic on the F125 and when operating the gears between PNDRS etc I could see that sometimes it did not update in Vagcom correctly, and ocasionally instead of showing PNDRS it would display a random number or character. The new F125 (aliexpress) tested perfectly, showing the correct gear, and still does. Indeed, the old F125 had become so defective that in my final testing on it before replacement it would activate the PNDRS lights of doom on the dash almost every time I moved the gear selector.
2003 RS6 MTM 568

User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Fri Jul 26, 2024 12:28 pm

Right, that's the F125 changed out. A shitty job that doesn't get any less shitty the more you do it.

Skyegtb, what's your technique for clearing enough room to get the F125 slid off the shaft? I can't help thinking there must be a better way than mine.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Fri Jul 26, 2024 12:30 pm

skyegtb wrote:
Thu Jul 25, 2024 12:33 pm
Indeed, the old F125 had become so defective that in my final testing on it before replacement it would activate the PNDRS lights of doom on the dash almost every time I moved the gear selector.
Yeah, mine was showing "noise" when moving between positions and I assumed it was normal, but the aliexpress one seems much better for that. Definite state changes when moving the selector.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

User avatar
skyegtb
3rd Gear
Posts: 319
Joined: Thu Sep 04, 2008 6:37 am

Re: Starter Motor failure

Post by skyegtb » Fri Jul 26, 2024 12:48 pm

Shoppinit wrote:
Fri Jul 26, 2024 12:28 pm
Right, that's the F125 changed out. A shitty job that doesn't get any less shitty the more you do it.

Skyegtb, what's your technique for clearing enough room to get the F125 slid off the shaft? I can't help thinking there must be a better way than mine.
The first 2 times I did the job I had the full enjoyment of unbolting everything around the switch to get it in and out and seem to remember it was hours and hours of very horrible and frustrating work. The 3rd time I did it, I was so depressed with the prospect of doing the job by the book that I resorted to cutting a 10mm approx sliver of the fin on the gearbox mount away, just to give enough space to get the F125 in and out. Now I can change a F125 in about 15 minutes start to finish, and can confirm the gearbox mount is still as solid today as when I cut the piece off all those years ago. I also replaced the torx head screws that hold it on with hex head which also makes things easier. I have had the pleasure of changing mine a total of 4 times now with the cheap Chinese switch being the most reliable of the lot so far. Perhaps it will last many maore years, but if not I know that changing it will be simple. I do have a picture somewhere to show what I did, if I find it i will post it up.
2003 RS6 MTM 568

User avatar
Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: Starter Motor failure

Post by Shoppinit » Fri Jul 26, 2024 12:52 pm

:thumbs: I started sawing that fin off, but with only a hacksaw blade I realised it was going to take hours. I think it'll have to go, though. It's function seems to me to be a heatshield for the F125, but it's easy enough to fabricate something else. I'll have to find an appropriate tool.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

User avatar
skyegtb
3rd Gear
Posts: 319
Joined: Thu Sep 04, 2008 6:37 am

Re: Starter Motor failure

Post by skyegtb » Fri Jul 26, 2024 12:56 pm

Yeah, as it was over 10 years ago I did this I am struggling to remember, but think I fashioned a cutting tool out of a full size hacksaw blade with a short wooden handle on one end, but there may have been something else I used as well. Maybe I took a picture at the time, I'll check when I get home tonight.
2003 RS6 MTM 568

Post Reply

Return to “RS6 / RS6 plus (C5 Typ 4B) 2002-2004”

Who is online

Users browsing this forum: No registered users and 145 guests