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1040658 Did this problem ever get resolved. I'm currently having the same problem on a 97 Cherokee. The light comes on (with a code 21) and when my mechanic resets the code and checks the sensors they both are operating normally. How did you solve your problem? Thanks[addsig]

1040659 I've got an "interesting" problem with my 97 Jeep cherokee - 4.oL engine. The infamous check engine light came on - with codes indicating a problem in the oxygen sensor circuit. My mechanic replaced the rear sensor (twice - but that's a long story) but the Check Engine Light is still...