$30 harbor freight fuel pressure regulator has the right connectors. Def test.

The FPR is in the fuel filter, so not sure what you have? Swap the O2 sensors..it's easy, get the small socket wrench attachment on Amazon for $8. You don't need the entire kit, just the one tool.

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa