Code P0155 engine light has been on for 7 months

What is your question?

Have been fighting this issue since last Sept. Have had Cat converter heat test, exhaust system checked , fuel injector cleaning, New 02 sensors (mopar) harmonic balancer checked , Throttle body inspected, new spark plugs, even had a wire in harness replaced that dealer said looked burnt and said had a cracked fuse to sensors replaced at the same time. The Jeep runs fine at high speed but idles like a washing machine out of balance , also continues to code for 02 sensors, before wire replaced showed open circuit for 02 sensors, after wire replaced still shows open circuit for 02 sensors One shop thinks carbon build up on valves hence the injector cleaning Don't know what to do really don't want to think it could be engine also shows no misfires when tested. Does it sound like more testing of electrical is needed? Sorry for writing a book but it has become a drama...Thanks to anyone that has an idea other than tearing into my engine, no disrespect to any pro but I'm scared to trust. Wiring is pretty scary don't know of shop in Terre Haute Indiana that would be good at it..also Jeep is California Emissions also might add that second shop I went to opened harness a 2nd time and could not see where dealer had spliced a new wire ??? Jeep is 2000 has 58,700 actual miles on it and has been spoiled rotten, never any engine lights or past problems until this started..