2004 5.3 o2 sensor problem

By Tmcdade
January 22, 2007 in Ask A GM Technician

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Tmcdade

Posted January 22, 2007

have following codes P1133 man. control fuel.air. P0300 random/multiple misfire. P0171 system too lean. P0131 O2 sensor, circuit low volts bank1 sensor 1. readings are as follows

O2s11 .000V O2s12 .935V O2s21 .1 to .8V O2s22 .6V.

Not sure what correct voltage is supposed to be at idle, or which one is which, to replace. Can anyone help me out?

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