ricehater2000

Hey guys just have a quick question since I dont have access to a scan tool. I want to check my 02 sensors to make sure they are functioning properly, is it possible to backprobe the 02 sensors to make sure they are not being lasy or stuck below .5 volts or above?

ShevrolayZ28

iTrader: (4)

Get a scanner that shows voltage values as the car runs. BTW, the car will show an SES code if they aren't switching fast enough, unless of course someone has set the codes to "no report"....and even then, some cars, like mine for example lol, will still report.

jimmyblue

iTrader: (11)

A modern DMM will do the job pretty much, you only need
to see that the voltage wanders at idle and pegs high at
WOT. A roughly 450mV, not-moving voltage is a sign that
the PCM has faulted the sensor.