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Hey, so what are the fuel trims, are the positive or negative. You can monitor them with the obd2 fusion. See if both banks are messed up, might be, but only one is throwing the code at this point. If the trims are over maybe +/-10 percent, it throws the code. The engine is either adding or removing too much fuel. If adding fuel resulting in positive trim, I'd suspect air leak or maf. If negative trim, like removing fuel I'd suspect fuel pressure, O2 sensors, leaky injectors. If it's not stalling or misfiring, you can probably rule out many things. If no other codes and fuel trim is negative, def change the O2 sensors..
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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
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