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Check engine light on. Showing error codes P0159, P0174 and P0837. I know the 159 is the Oxygen sensor Bank 2, Sensor 1. Also, the dash lights up occasionally, showing "part'time" when transfer shifter is in 2WD. First, how to I find out which Oxygen Sensor to order and Second, how do I fix the 4wd shifter problem?

Vehicle: 2004 Jeep Grand Cherokee, 4.0 liter straight 6 cyl.

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