Part number for S3 rear differential?

[oyvind_norway]

I went from D to L, you can keep the existing Haldex ECU to avoid having to programme the new one, it's just plug and play that way. What happened to your rear diff? Your oil disappeared like mine?

Yes, gone It is a mystery

 

[HertS3]

Strengthens my case that the part is inherently flawed, how can Audi claim it's sealed for life if there are air vents on the top?? It's not a sealed system.
Audi dealer blamed the independent garage I went to of accidentally draining the rear diff oil when they changed the Haldex oil!! Ridiculous.

 

[oyvind_norway]

I use a independent garage to fix it for me because Audi just want to sell me a new part. They also tell me that the only part I can use is 0CQ 525 010S...

 

[HertS3]

Yes, I had an independent fit a used one I got on eBay from a breaker, Audi will just want to sell you the newest version, not sure about the price in Norway but in the UK it was around £3,500

 

[oyvind_norway]

Audi = £6000
I can buy a refurbished one from a independent dealer about £2000

 

[HertS3]

Wow I bought one from a breaker for £380!

 

[oyvind_norway]

Wow I bought one from a breaker for £380!

I probably ending up with one from a breaker for about £400

 

[alpesh26]

What are the symptoms of a knackered diff? Something on my car is whining at 70mph but only when im on the throttle, I can't place where its coming from.

I have replaced the oil in the diff due to accidently draining it (don't laugh) when doing the haldex oil so I know there is definitely oil in there as it took a full litre to fill it.

 

[HertS3]

LOL kudos for doing stuff yourself anyway!

My made a whooshing sound which seemed to get worse on the motorway, plus if you floor it from standstill it sort of wobbles, not take off straight away. The whining appears to be bits of metal shaving going through the diff. When it went completely it sounded like I was dragging a tin can behind me

 

[alpesh26]

LOL kudos for doing stuff yourself anyway!

My made a whooshing sound which seemed to get worse on the motorway, plus if you floor it from standstill it sort of wobbles, not take off straight away. The whining appears to be bits of metal shaving going through the diff. When it went completely it sounded like I was dragging a tin can behind me

I said don't laugh!!

Was it making noise regardless of being on the throttle? I might try closing the exhaust valves and see if that helps with my issue

 

[HertS3]

I found that you could hear the noise best when off the throttle though presumably it made the noise all the time, don't laugh but I'd just put winter tyres on (first time I'd had some) and thought that the noise was coming from them!!

 

[oyvind_norway]

Mine has a rumbling sound from zero and all the way up to 80 km/h, and from 80 it sounds like Axel Rose on a very bad day

 

[PrivateRy4n]

My RS3 diff has gone and the part number from audi is ACR 525 010S but i have found a similar one 0CQ 525 010C, will this diff fit and be okay? what is the difference

 

[jamal1]

Mine has a rumbling sound that increases/decreases with speed, is it too far gone when this happens and needs to be replaced? Never had to deal with a problem like this before

 

[HertS3]

Mine has a rumbling sound that increases/decreases with speed, is it too far gone when this happens and needs to be replaced? Never had to deal with a problem like this before

Could be, I'd get it checked out pronto

 

[Wyseoldman]

I'm the author of the above post - I know all about rear diffs! Mine is a late 2014 build (car delivered early 15) and I had the F variant on my car. You can get any 0CQ525010X where X is what you have or later; there were D, E, F, H, K, J, L and S I believe (S is the current version you get new from Audi if you fork out £3,800!!!)

There are a few knocking about on eBay, what I would say is play the waiting game, not many of these sell, if you watch the items or message sellers they'll give you big discounts on the prices they ask on their listing. If you look at the thread above, I found one guy that was willing to sell for around £200. I'd be weary of West Yorkshire-based dealers, the one I got was from a Nottingham breaker and (touch wood) all fine so fa

I'm the author of the above post - I know all about rear diffs! Mine is a late 2014 build (car delivered early 15) and I had the F variant on my car. You can get any 0CQ525010X where X is what you have or later; there were D, E, F, H, K, J, L and S I believe (S is the current version you get new from Audi if you fork out £3,800!!!)

There are a few knocking about on eBay, what I would say is play the waiting game, not many of these sell, if you watch the items or message sellers they'll give you big discounts on the prices they ask on their listing. If you look at the thread above, I found one guy that was willing to sell for around £200. I'd be weary of West Yorkshire-based dealers, the one I got was from a Nottingham breaker and (touch wood) all fine so far

Hi Hertz,
I am chasing a complete diff and Haldex for my Octavia, current part number is OCQ 525 010 D. I have found one from a 2020 T-roc same part number followed by AB, I am hoping this could fit??. Your thoughts would be very much appreciated.
Thanks.

 

[HertS3]

Hi Hertz,
I am chasing a complete diff and Haldex for my Octavia, current part number is OCQ 525 010 D. I have found one from a 2020 T-roc same part number followed by AB, I am hoping this could fit??. Your thoughts would be very much appreciated.
Thanks.

No idea I'm afraid, I don't know what AB means