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Mmmmmmm, fail.
Emptied out the oil and replaced 4lt. Drove the care about 30km.
It seemed to reset but then failed again with SERVICE being displayed below the level. I'm happy with the level at the moment.
Checked ISTA and it made more sense this time. Finally figured out how to generate a service plan for faults.
Read out vehicle data => Complete Identification
Control Unit Tree => Display Fault Memory
Fault Memory => Calculate test plan
Test plan indicated checking the connecting cables and possibly replacing the sensor (which I've done). The good thing is that the cheap Chinese sensor seems to work, also means that the original was probably working too :P. I'll have to study the wiring diagram a bit. I did check the cables and all seemed to be in reasonable condition. Probably need to check continuity and resistance with a multimeter but not sure what resistance should be.
The SERVICE warning seems to be undocumented.
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