Oxygen Sensor failed after brought it to Canada - cold weather
I bought my Grand Cherokee Limited with a V8 engine in California back in 2000. I brought it to Canada three years ago. The CEL went on and it indicated oxygen sensors failed, both upstream and downstream. I did not do anything for two years. Recently, I replaced all four, but then the CEL came on again after 4 days, reset the light, it came on again after 48 hours and it indicated all 4 failed again. I wondered if the cold weather here in Canada requires a different set points in the computer and the oxygen sensors were not really failed in the first place.