O2 sensor
#1
O2 sensor
On my scanner two out of the three o2 sensors the values change rapidly. They are up and down while idling and driving
They are very inconsistent they range from .100 to .800. I'm guessing this isn't normal
They are very inconsistent they range from .100 to .800. I'm guessing this isn't normal
#2
Perfectly normal for the upstream sensors to change rapidly. They react to changes in fuel mixture so the ECM can adjust it accordingly. A low reading .1 indicates a lean mixture and a high reading .9 indicates a rich mixture. They should never indicate above .9 volts. The faster they react to mixture changes, the faster the ECM can adjust injector pulse width and provide better fuel economy. Overall, the voltage should average around .450 volts. The downstream sensor monitors catalyst performance only and should remain relatively steady around .4 volts.
Thread
Thread Starter
Forum
Replies
Last Post
joey
2nd Generation S-series (1995-2005) Tech
4
08-27-2012 06:33 PM
GM hater
2nd Generation S-series (1995-2005) Tech
7
01-09-2010 02:32 PM
theeviltwinn
2nd Generation S-series (1995-2005) Tech
2
10-23-2009 06:37 AM
daniel010
Engine & Transmission
8
02-02-2009 06:50 AM
Spartan66
2nd Generation S-series (1995-2005) Tech
6
07-11-2008 02:34 PM