I was working on this XJ that was throwing a CEL. Came up as an O2 sensor. Replaced the O2 sensor, still throwing a CEL.

Is there another sensor I am not seeing?

Anyone have a diagram of the 4.0?

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not sure what year you have, but there is a posibility that there is two o2 sensors. one infront of the cat and one behind it.

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I am not sure on the exact year, but it is a 97-01

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Yours should have 2 sensors than

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85 shelby charger (getting there)
77 plymouth arrow with a 360 4 barrel
(v8 in a 2200 pound car should be fun)
88 jeep xj 6" lift 318 swap 33" (going away).
New ride 94 Grand cherokee 318 with a 5" and 33" soon.

What was the code?

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97 Ram Sport ext 4x4, 5.9L gas, 3" pro comp lift w dual shocks, 3:55 trac lock
Lt305/70R16 Kumho KL-78, K&N FIPK, Mopar Performance wires and cap, Stainless shorty headers, Walker exhaust. All syn lubes. Sirius sat radio! Magellan GPS
2003 Grand Caravan Sport. 3.3L No toys in it. Nobody's cool in a Minivan...