2002 Impala LS O2 sensor live data
 

Hi,

I took a live data reading with my scanner, The first Scan showed no code thrown. I did a second scan and it show a 0140 as a set code and a 0134 as a pending code. Both are O2 sensor codes. On the print out I see the #1 sensor fluctuates and shows 0 voltage. The #2 sensor stays at a steady 450 with 0 volts. Should they both be showing some voltage. Does the fact that the #2 sensor doesn't fluctuate mean it's bad ( I just replaced it).
Any comments are appreciated.

Steve

depends which 02 sensor your talking about. both are supplied a bias voltage of 450mvolts until they reach operating temperature. the precat 02 should switch rapdily, the post cat 02 should not.

make sure the 02 heater sensor fuses are good.

OK thanks