I have a 2004 jeep grand Cherokee 4.0 liter California emissions i changed all 4 o2 sensors and codes p0155,p0455,p0432 came back.why is this happening?

SOURCE: P0155 & P0135

O2 sensors are tricky. sometimes like anything else they fail. many times though the exhaust mixture they encounter is out of their range and that shows up as a failure.since you seem to have no other problems , I would go ahead and change them, but don't be disappointed if the code shows up again (at least you know it's not the sensors.) I don't like using the process of elimination when doing repairs but sometimes you must.

SOURCE: I have 2004 Jeep Grand Cherokee special Edition

have you checked the IAC, idle air control,or cleaned the throttle body and plate.

SOURCE: 2000 cherokee 6cyl 4.0 has given code p0432 and

Not necessarily, the catalyst monitor uses two oxygen sensors to monitor the operation of the converter. One or both of the sensors may need replacement. One tip, they are much easier to remove from a hot system, although the chance of a burn is greater.

SOURCE: 2004 jeep grand cherokee with

There's noway all four o2 sensor can go out at the same time, need to check for a vacuum leak, that will set an o2 sensor code.

SOURCE: i've changed all of the

The wiring harnesses for the O2 sensors run right next to the exhaust manifold, and get incredibly hot, sometimes causing the wires within the harness to crack or break. This would cause your problems. Have a look at the harness and let me know what you find.