Wednesday 18 March 2015

The downstream o2 sensor

An oxygen sensor placed after  the cat  on  certain  cars  is a verification of the   the cats  performance
Their  voltage reading  if everything is  normal  will be  stable  around  .4  volts
If they do set a po136  code then  its  more  than likely  the sensor at fault not the wiring  but of course it can be just that


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