HT4100 4.1, 4.5, 4.9 Discussion, O2 sensors : 1 righ and 1 lean in Cadillac Engine Discussion; Replaced the O2 sensors today. front sensor was grey/white which I believe it means lean, the rear one was black ...
Replaced the O2 sensors today. front sensor was grey/white which I believe it means lean, the rear one was black which appears to be rich. Any ideas what I should take a look at first to get these both back to normal.
The difference in the two sensors could simply be caused by the resulting running condition of one of them failing. Could also be bad injector(s) on one bank or a really bad constant misfire... Check for code E046. How does the car run before/after the new 02 sensors?
Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
Re: O2 sensors : 1 righ and 1 lean
If you did not have a service engine now light on and a code related to weak, lazy oxy sensors, you now have 2 good spares. The color of the probe has nothing to do with how they operate. Monitored thru on board diagnostices you can watch the voltage change to verify switching lean/ rich at the right intervals.