Very common on the 1998 models, this sensor has been modified several times. The latest number is 004-153-53-28 & has a list of $89.
ALSO lack of oil changes will cause havoc on this part!
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)