O2 Sensor

Changed my down stream O2 sensor
is there a way to tell if it's bad.

I'm trying to get my catalyst monitor to be read for my stupid smog.

 

How many miles on it? We're you getting a code (CEL on)?

Of all the ones I've changed, there has not been a visual way to tell. Only the malfunction code. There may also be a way to test it. You could check the service manual.

 

My catalyst monitor wont become ready to pass smog so I am slowly replacing parts


the truck has 170K not sure how many miles on the O2

 

From the service manual:

 

You have the v6:

 

Specs look to be the same though.

 

This the ghetto way but it works...

if you have a digital multi meter you can put it in a vise, gently, do not crush it or crack the insulator. Put you digital multimeter on volts DC less than 3v scale, you want the non heater side leads and put a propane torch to the sensor and watch the voltage. It should rise as you apply heat to .9v DC and hold steady. Take the torch away and watch the voltage drop. Repeat to verify.