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I've got an N54 with 50,000 miles on it. Just replaced spark plugs with OEM BMW ones.

I just had my bank 1 after-cat oxygen sensor changed, and now I'm getting these codes:

23C2 lambda probe in front of catalytic converter 2, trimming control.

2C6A lambda probe behind catalytic converter, muddled.

2C7E lambda probe behind catalytic converter, trimming control.

2C6C lambda probe behind catalytic converter 2, system check.

2C31 lambda probe in front of catalytic converter, trimming control.

What could be causing this?