Low battery volts will cause all kinds of headaches and false codes. If it's old, replace it. Charge it up now and then when not driven. A battery tender works great.

Bad MAF connections or air intake leaks will hurt short/long term fuel trims. The data readings will point to bad O2 sensors. P1174/P1175 indicate bad O2 sensors. P0174/P0175 are O2 readings point to vacuum leaks, bad plugs, MAF issues, and other items.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)