Symptons of faulty oxygen sensor? 1992 Accord EX, 257K, sensor never changed. Check engine light has never come on.

 

Poor gas mileage
fails emissions testing
erratic idle (not very obvious)
What makes you think it may be bad?

 

Strong exhaust odor at cold startup, strong gas odor at cold startup, rough idle

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowman &raquo;</TD></TR><TR><TD CLASS="quote">Symptons of faulty oxygen sensor? 1992 Accord EX, 257K, sensor never changed. Check engine light has never come on.</TD></TR></TABLE>

How many miles had the car when you bought it; previous owner might have changed it.
Im pretty sure the O2 sensor tends to fail after 100k miles.

 

48,000

 

sysmptoms of poor gas milage is openor improperly working t-stat

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by specbb6 &raquo;</TD></TR><TR><TD CLASS="quote">How many miles had the car when you bought it; previous owner might have changed it.
Im pretty sure the O2 sensor tends to fail after 100k miles.</TD></TR></TABLE>
So that's why all of my hondas have over 100K miles and still have the facory sensors? They may fail on others at those mileages but not a Honda. It seems like they either go early in life or not at all. Very few in the big picture ever go bad.