The most common source of faults on the longitudinal 7 speed S tronic that replaced the DL501 (0CJ / 0CK / 0CL) is the mechatronics unit as well. Typical faults are the input or turbine speed sensor (which makes the shifting unpredictable), clutch slip under load, and abnormal operation of the park lock.
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Servicing is a separate trap: because of the way the gearbox is built, this type uses up to three separate oil chambers and three filters. An incomplete oil change looks done at a glance, but the effect is missing.
between 60,000 and 100,000 km
What to check
- Standing still, shift between D and R and watch the engagement: binding, a jolt or a delay is suspect
- A jolt on the 1 to 2 shift is the most common early sign; try it cold and warm
- Under load (a slope, an overtake) watch for the revs flaring, looking for clutch slip
