Emission question
#11
The fact is that O2 sensors do lose efficiency as they age with high mileage. They may noy be throwing a CEL but they will negatively affect the fuel mileage and overall efficiency of the engine. I typically replace mine with factory original sensors (Motorcraft in my Fords) when the vehicle reaches 100,000 miles.
The following article gives some good insight and information:
http://www.obdii.com/articles/Unders...n_Sensors.html
The following article gives some good insight and information:
http://www.obdii.com/articles/Unders...n_Sensors.html
#12
They do age, but unless they're throwing a code, or fuel mileage drops off, or the car fails an emissions inspection for that reason there isn't any hard reason to replace them.
O2 sensor response usually gets a bit "lazy" before they give up entirely, and this is something that even most older scantools (like mine) can pick up straight out of the OBDII port.
Norm
O2 sensor response usually gets a bit "lazy" before they give up entirely, and this is something that even most older scantools (like mine) can pick up straight out of the OBDII port.
Norm
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