Quote:
Originally Posted by saumil
I am not sure that O2 sensor should be changed unless it stops to work. The voltage from the O2 sensor should alternate within a range (use AC voltmeter). If this is occuring, it is o.k., if it is pinned on low or high side, i.e. you see a constant voltage (use DC voltmeter because AC meter would read zero) then it needs a replacement. For eg. my car has >350K miles and it is the same O2 sensor. Had to replace the catalytic converter because that will clog over time.
|
Never seen a more incorrect statement.
O2 sensors not only switch ( high/low ) voltage signal, but also switch at a certain rate.
This is called " Cross Counts ".
As a sensor ages, it will " slow down ".
When it reaches that stage, fuel economy and exhaust emissions generally suffer.
Maybe if you had changed your O2 sensor at say 100 k miles or sooner, who knows, may not have plugged your catalytic converter.
O2 sensors are a
Maintenance item, i.e. part of a major tune-up.