My mechanic was the one who concluded that I needed to replace my pressure converters...I don't know how he came to that conclusion. When I asked him, "If only one is bad, can I replace just that one," he said, "since they worked in tandem, it's really best to replace both." And perhaps he knew that the SYSTEM of the two of them together was shot, but didn't know which one.

I paid just over $100 a piece from one of the online MB parts distributors.

NIGHT AND DAY difference after I replaced them.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife