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what year and model jeep? motor size?
how many miles on it?
have you manually checked oil pressure? has a compression test been performed?
it sounds like it will likely need to be pulled and rebuilt... I would verify oil pressure first and compression, But it sounds like rebuild or replace will be the answer
what is the code #?
that's lean bank one not lean cylinder 3
lean on one bank is usually caused by a vacuum or intake leak..