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The decisive factor for me is the error U0121.
All other errors are very spongy, because they indicate several regions of the engine that have nothing or nothing to do with each other.
The error U 0121 describes that the engine control unit cannot establish a connection to the ABS control unit. This missing connection in the high speed data bus of the engine compartment can cause errors in the engine control unit. It can be strongly assumed that the error is related to the speed display, because the wheel speeds of the ABS are missing.
The cause can be an undersupply of the engine control unit and the ABS control unit. Therefore, first check the ground points in the engine compartment to make sure they are all clean.
If this is OK, disconnect the plugs of the ABS and the engine control unit. There must be neither verdigris nor water in them.
If the plugs are ok, a workshop must check the data bus to see if it is ok.
If this is ok, the workshop must check the fuse box engine compartment (this is also a switch distributor which switches the current in the vehicle). These often cause problems with the model.
If this is also ok, the suspicion lies on the engine or the ABS control unit.
Experience shows that the ABS control units were more often the problem.
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