What are the symptoms of Audi sport differential problems?
Whether we're talking about an A4, A5, A6, A7 or A8, the problems with the sport differential are always the same. You're driving along when suddenly a warning appears: “Sport differential malfunction” and “Restricts RPM’s to a max of 4000”. But did that warning really appear out of nowhere, or is it the result of poor or overdue maintenance of your sport differential?
When we read the fault memory, we find either “0273 / C1004 F0 [008] – Oil Pressure and Temperature Sensor Oil Pressure Implausible”,
“ P168D oil pressure sensor 3, malfunction” or “0334/C1005 oil pressure and temp sensor 2 G640 implausible signal”.
At first glance, the problem seems simple: replace one or more sensors and everything will work again. Not quite 🙂 You replace the sensors and the oil, but the faults remain exactly the same. Why?
As you know, this differential uses 2 oils. One is in the differential section and the other is in the clutch section. When genuine oils are used, they are changed at the same time as the gearbox oil. But when this service is neglected, friction material shed by the clutch packs contaminates the oil so badly that it becomes like sandpaper, destroying the differential's pump and valve body. In other words, this differential is perfectly robust, provided it is serviced.
How do you fix Audi sport differential problems?
Many authorised Audi dealerships will recommend replacing the entire differential, at a cost of BGN 7,000–15,000, depending on the vehicle's specification. As I've already mentioned, other workshops may simply replace the sensors and change the oil, leaving the underlying problem unresolved. The fact is that there's only one solution: replacing the valve body, pump, both sensors and oil.
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