Originally Posted by
Hondaman
I have always heard that an O2 sensor can fail, but will not always trip the CEL. From what I recall, if a failure occurs they are designed to make the engine run slightly richer instead of lean to protect the engine. A sudden drop in gas mileage is an indicator of this condition.
Has anyone else heard of this condition?
I guess anything is poss. but more likely than not, of the 02 sensor is notm functioning correctly or at all, it is going to let the operator know by way of CEL. We're talking sensors here which is more of a software than a hardware.