Cadillac Repair: check engine light on, 1990 cadillac seville, twilight sentinel

Question
I have a 1990 cadillac seville and am getting the following codes on my onboard computer and would like to know what they are? EO46, B120, B121 and how do I repair same these are current codes

Answer
E046 = left to right fuel inbalance.

B120 = twilight sentinel delay potentiometer problem.

B121 = twilight enable circuit problem.

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