I have read a lot of posts here referring to the o2 sensor. I understand what these devices measure when working properly, but had some general questions. Do these devices have a finite life? If so, is it a number of years installed in the car or does it more depend on the number of miles on the engine? Or both. How long can they last? Should it be periodically replaced to keep the engine running optimally? When these devices fail, do they tend to tell the engine management to lean out the mixture or enrich it? Thanks for your help JB
88 300E 99 E55- posted
17 years ago