Rear Oxygen Sensor -- DYI?

Discussion in 'General Motoring' started by Thomas Nickerson, Nov 29, 2006.

  1. My Saturn dealership tells me that the rear oxygen sensor on my 2003
    Ion 1 needs to be replaced; it is "not switching lean to rich". If
    anyone has done it, is this job a DYI candidate? The garage wants $191.


    Thomas Nickerson, Nov 29, 2006
  2. Thomas Nickerson

    BläBlä Guest

    Rear O2 = Down Stream to me... The reason they gave makes no sense to
    me. Why SHOULD it switch from rich to lean when it is "down stream" of
    the converter? It should remain at or near .5 volts with very little
    fluctuation. Is it throwing a code? Is it stuck reading above or below
    ..5v? Yeah this can be a DIY'er job...that is if it is even in need of
    BläBlä, Nov 29, 2006
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