Two problems related to emission control have been reported for the 1997 Jeep Cherokee. The most recently reported issues are listed below.
Engine lost all power, causing multiple near rear end collisions. Diagnostics indicated in Chrysler service manual posted "55" (end of mil codes) indicating no failed components. Service station replaced O2 sensor and cleaned subsequent impacts to fuel injectors. Per Chrysler service manual, O2 sensor failure code "21" should have been indicated for such failures, thus affording a warning to driver of failed component.
We brought the vehicle to lehighton motors in lehighton, PA and they were not able to detect the problm so we were fitted with a black box and were told to drive around and activate the black box when the problem happened. This was a dangerous situation for us. They changed both O2 sensors. The problem persisted, and they decided that the fuel tank sensor package needed replacement. All this cost bout $800. 00 for parts that were in a car with 35,000 miles, and it put us in seriously dangerous circumstances. We contcted daimler/Chrysler for relief, but to no avail. Please investigate this situation.