Customer says: Outside temp display showing fluctuating temps reading that is sometimes accurate then display goes blank then comes back on reading a temp that is always about 20 degrees colder than actual outside temp. Had problem for past two years

MB Dealership Tech replaced Temp sensor wire from front License Plate assy area through Engine Compartment Wiring harnes back to Dashboard Display 55 dollar part and two hours labor at $91.00 PH - did not resolve problem.

Tech wants to replace Display unit next and see if that resolves.

Since I dont wanna finance the pluck&chuck-til-we-fix-it method, can anyone offer possible solutions.

TIA

Tom