It means it is working and doing its job.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Leo Lee
Sent: Saturday, April 23, 2005 1:24 PM
To: vanagon@GERRY.VANAGON.COM
Subject: O2-senser voltage testing

To detect the voltage deliver from the O2 senser to the ECU after engine
warm up, I connected the positive end of a voltmeter to the green wire
coming out of the O2 senser, and negative to the ground. After engine
warmup, I observed the voltage. A higher voltage (0.7- 1.0) indicate a
rich condition, low voltage (0.6 and lower) means leaner condition. I
found that the voltage continue to fluctuate between 0.2 to 0.8. Can
someone please tell me what is this mean?
Leo, 1991 multivan.