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P228C sets when the The actual fuel rail pressure is 3 MPa (435 psi) less than the desired fuel rail pressure which usually means the high pressure fuel pump has failed but there is a tsb that covers this problem, here is a copy of tsb and testing information. C0242 may be caused by the P228C so I'd start with that. Let me know if you have more questions, thanks.
I have no idea why they would recommend replacing those parts as it has nothing to do with these codes, I wouldn't pay attention to anything car MD said. Let me know if you have questions, thanks.
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