O2 sensors
CF Veteran
Joined: Feb 2011
Posts: 3,074
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From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
always change all 4 why do the job half *** no offense but your Jeep has 160k do it once do it right.. sounds like you have cali emission jeep those sensors are really senative... all 4 sensors are probably done at that mileage... the rear o2 do effect mpg.... no matter what you say or hear... just going by experince on this one... thats my advice 
good luck
good luck
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