One or more sensors most likely has an internal fault. PTS sensors do not
take kindly to being hit or scraped. Your MB dealer can run a SDS short test
for codes. The offending sensor will be identified by the computer.
They can test all the others for accuracy as well.
Regards,
Dr.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?