2003 C320 the stft is about 2% rich on bank 2. Ltft adjusts well maintaining a -5 to -8%, but when I need a gutsy bust of power lftt 2 goes past -24% before the system can adjust.

How should I trouble shoot it? I'm thinking one or two of the injectors on 4,5,6 side are spraying too much. To head off the outliers: Side 1 is working finewith stft and ltft working both sides of 0 never building a bias + or -. Only the drivers side is running rich and only on some accelerations.

I'm thinking swap left and right front and middle injectors. If the problem remains, swap the back. If the problem remains, it is not the injectors. Then what?

Can you maybe swap O2 sensors first to rule that out?

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