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Recently got my first new (to me) Jeep! An '02 Liberty 3.7 with 187k km on it. The check engine light is on, so I got the shop to pull some codes for me. Here's what came up: P 0161- HO2S Heater Circuit bank 2 sensor 2 P 0158- HO2S Circuit High Voltage Bank 2 sensor 2 So, do I need to...