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Update: the other HPFP crapped out, unfortunately had a similar experience as before with the dealer service dept. Updated that linked thread, also cliff's notes:
-Identical symptoms/behavior & codes as last time
-Dealer again misdiagnosed it, this time as a bad fuel rail pressure sensor
-Insisted they investigate the HPFP
-HPFP replaced under warranty, fuel rail pressure sensor now working just fine
-Faith in dealer techs reduced from 0 to -1.
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