The Haldex coupling on the VAG range is something which I know is often overlooked. This 2017 Škoda Kodiaq 4X4 was in for service and one of the owners concerns was the condition of the Haldex coupling fluid.

The Škoda had only covered 20,000 miles, so I wasn’t expecting the fluid to be too dirty. The fluid is easily drained down and when draining it looked to be clean. As this unit does not have an external filter, it is a good idea to get the pump fitting kit, which consists of two 6mm bolts and the two ‘O’ rings and then remove the pump.

The mesh filter on the end of the pump collects all the contaminated particles of oil. Looking at the condition of this one after only 20,000 miles, I would strongly recommend that this is regularly carried out to prevent undue problems from occurring.

I will admit to being surprised at the condition of the mesh filter after such a short time, especially as mentioned that the oil did look to be very clean. So, if you get a VAG 4X4 in your workshop for a service, it is worth advising the customer to have that Haldex serviced. It could save a few problems in the future.

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