Can anyone else cite from experience getting fuel trim codes with no other errors? I had negative trims with my bad O2 sensors. When I had a huge air leak, causing engine misfires and car shaking.and sometimes unable to drive, needing a restart. It never gave me fuel trim errors. I had air leak and misfire codes, but nothing with fuel trim.

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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