Replaces the cracked accumulator housing inside the 0AM DQ200 seven-speed dry DSG mechatronic that causes harsh engagement and lost gears.
If your VW Golf, Jetta or Polo, Audi A1 or A3, Skoda Octavia or Fabia, or Seat Leon or Ibiza with the 7-speed dry-clutch DSG has started banging on take-up, hesitating before it picks a gear, or flashing the gear display and dropping to neutral, the cracked accumulator housing on the mechatronic is the first thing to suspect. This kit replaces that housing on the 0AM (DQ200) unit and supplies the gaskets and seals you need to put the mechatronic back together tight. It covers OE numbers 0AM325066AE, 0AM325066AC, 0AM325066AA, 0AM325066C, 0AM325066R and 0AM325413A.
The DQ200 does not run its hydraulics off the gearbox oil. The mechatronic has its own small sump, its own electric pump and its own mineral-based oil. The pump charges an accumulator: a gas-charged piston on one side, oil on the other. That stored oil is what the solenoids use to engage the two dry clutches and move the shift forks, and Gears Magazine puts its normal working pressure at roughly 40 to 60 bar (580 to 870 psi), with peaks near 70 bar. The aluminum housing that holds the accumulator and the pump outlet sees that pressure every second the car is running, and it is the casting that fails.
The tricky part is that a crack can start with no drivability symptom at all. The housing seeps, the pump works harder to keep up, and the car feels fine until it does not.
Scan data tells you more than a road test. With the engine idling at operating temperature, watch the mechatronic pressure switch and how often the electric pump cycles on. A healthy unit charges the accumulator and then rests; a cracked housing keeps the pump running or cycling quickly because pressure bleeds away. Pull the codes, look for oil around the mechatronic, and check the mechatronic oil level. Our DSG pressure testing guide walks through the pressure side, and DSG overheating causes explains why a pump that never shuts off cooks the unit.
This housing is for the 0AM / DQ200 seven-speed dry dual-clutch only, in front-wheel-drive VW, Audi, Skoda and Seat cars. It does not fit the 02E / DQ250 six-speed wet-clutch DSG, and it is not for the 0B5 or DQ500 seven-speed wet units. The casting supplied is the 4.6 mm version, the thicker replacement used in place of the thinner original. Check the transmission code on your gearbox label or in your scan tool and match it to 0AM before ordering. If you are unsure, send us your year and VIN and we will check it. Browse every dual-clutch part we carry on the DSG and dual-clutch collection page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is only for the 0AM / DQ200 seven-speed dry-clutch DSG. The 02E / DQ250 is a wet-clutch six-speed with a completely different mechatronic.
A cracked housing lets pressure bleed off, so the mechatronic pump runs or cycles constantly at idle and you often see oil around the unit. Solenoid faults tend to set specific valve codes while the pump and pressure behave normally.
The DQ200 mechatronic uses its own mineral-based hydraulic oil, separate from the gearbox oil. Fill it by the specified capacity from your service information.
Yes. Run Basic Settings with the oil between 30 and 60 C and then the defined test drive so the clutches and shift forks relearn. Skipping it leaves harsh, unpredictable shifts.
The 4.6 mm housing is the heavier casting used in place of the thinner original, which is the part that cracks under accumulator pressure.
