My CDI starting throwing a 2025-1 two weeks ago, which my Foxwell says is

Check Component B28/5 (pressure sensor downstream of air cleaner). The signal voltage is too high.


I swapped out my MAP sensor (that is B28/5 according to the WIS) and still received the code. I then tested the MAF wires, I am getting 5V and 12v from 3 and 5 respectively which is correct.

So I opt for a new MAF, the whole housing, MAP and MAF sensors on it. Replaced that last night, cleared the codes, started it up and it threw it immediately.

Any idea where to look next? The WIS doesn't give you places to look for diagnostics. I am wondering if there is a vacuum leak somewhere.

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2005 E320 CDI - Totaled