I have a 98 Ram (built in Sept of 97) that is coming up on 10 years old. I have the original o2 sensors on the puppy. Should I be looking at changing them based on age or do I wait until I get an idiot light on the dashboard? I have changed out all of the sensors on the throttle body when I put in a fastman TB last year. Would I see any improvements by just replacing them? I tried to do it myself, but I could not reach the connectors so I returned the sensors. I don't mind spending the bucks if it will make a difference in performance etc.

 

if the truck is running good, normal mpg, no cel, etc, i would leave it alone. new o2 will not increase performance, most likely just work exactly like the old one.

 

Bosch recommends changing the O2 sensor at specified intervals:

http://www.autohausaz.com/html/emiss...n_sensors.html

Heated (2nd generation) oxygen sensors on mid-1990s and newer vehicles Every 100,000 miles

 

i just cleaned mine, i have a '98 with 120,000 and they were hardly dirty

 

The sensor article says "The result can be a richer-than-normal air/fuel mixture ....."
So, [sm=massbounce.gif]would older O2 sensors be a performance advantage?

 

No. It will eventually take a toll on the O2 sensor, the cat, and other parts of the emission system.