Code C102B will set when a fault is detected with the rear wheel speed sensor circuit.This can be an issue with the sensor itself or the wiring and can affect the speedometer operation.I would start with checking wiring to this sensor and see if any wiring is found damaged needing repaired.In most cases the sensor itself needs replaced to correct this here.This will also cause hard shifting issues.
Code C1032 is the same with a fault with the rear wheel speed sensor signal with erratic performance.This can be the same with wiring at fault or possibly the sensor itself in most cases.
Code P0420 will set when there is low efficiency with the catalytic converter.Usually this indicates the catalytic converter needs replaced.In some cases if there is damage to the converter or any exhaust leaks or an after market catalytic converter this can also cause this code to set with it needing corrected to resolve this here.
Code P0501 is related to the rear wheel speed sensor as this is a vehicle speed sensor code.The signal for the speed sensor is not being picked up from the anti lock brake computer to the engine computer and sets this code.
Code U1417 is a code for the left wheel speed signal.They want the rear wheel speed signal diagnosed and repaired first before continuing with this code and to see if this corrects the fault here
Code U1418 will set when there is a fault with the right speed sensor signal.Once again they want the rear speed circuit repaired first to see if this corrects the fault here.
I would lean on checking into the wiring for the rear speed sensor signal and if o.k. replace the rear speed sensor then clear all codes and re operate the vehicle to see if the faults are corrected.As for the catalytic converter check for any exhaust leaks or damage as well as any after market exhaust components needing replaced and if these are o.k. then the catalytic converter needs replaced.
The speed sensor issue is the one that is causing all of the issues here though.
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